Hello Lovebutgah & welcome to the forum.
You thought that you were in a great relationship, but it's not so good at the moment, so let's see if we can sort out what is going on.
You were great friends for a year and a half before dating & you have been together for 7 months.
I'm guessing that you thought that you knew him very well, when you suddenly discovered things about him that you hadn't known and didn't like ~ and then, probably when you needed most to be together to sort things out, your relationship became a long distance one.
Just as you reached a stage where you were doubting that you really knew him so well, and wondering if you could completely trust him, you were separated and then you started to feel jealousy ~ and jealousy is a destructive emotion for all concerned.
You have only been boyfriend and girlfriend for seven months and, presumably, for part of that time you have been apart. If it were not for the fact that you had known him well, before, I would have suggested that you may not know him well enough to be making plans for the future, anyway. As it is, with all the negative emotions going on, I would still suggest this.
You say that you trusted him completely for the first three months, but, if you trusted him, why snoop through his e-mails? Perhaps you had trust issues already?
And, should he feel able to trust you, when you admit to snooping through his private correspondence?
Anyway, you say that the emails were very bad ~ attempting to hire escorts and masseuses. I would agree that this sounds bad and if I had found out such a thing about my boyfriend, I, too, would have become very emotionally upset and angry and confused ~ even if it was before I had met him. I would have wondered why he could have behaved in such a way and whether he truly was who I had thought he was.
If he had then lied about it, I would have wondered if I could trust him.
However, some boys do do this. There are some very nice men who behaved a bit like this in their youth. Some do this for stag nights, etc. I think that some girls do this sort of thing too, but it is mainly a male thing ~ porn, prostitutes, nude calenders, wild times, before they settle down.
It was probably considered it to be just a bit of fun, from before he knew you, but he knew that it might upset you, so he lied to protect himself and you ~ then he realised that this wasn't helping the trust issue, so he came clean.
I can fully understand why they got to you, but, just because he did some wild things in his youth, before he even met you, doesn't mean that you cannot trust him now. It wouldn't even bother some girls ~ but it bothers you, and I think that it would have bothered me. It's a personality thing, I suppose.
And I think that this may also help to explain your feelings towards his ex-girlfriend. You are angry and jealous as if he were still having sex with her now. You know that it happened, and, though it's over now, that doesn't alter the fact that it happened ~ and so you are jealous.
But you have to think this through logically ~ you have had exes too. You became pregnant by one of them. Your boyfriend could have become jealous of this, if he were that way inclined.
And, yes, since your exes couldn't be trusted, your brain may be expecting similar behaviour again.
Maybe you are a little bothered because he kept the e-mails and still has the bikini girl calenders?
He feels that your emotional reactions are getting so bad that they are threatening your relationship.
You say that you cannot imagine life without him; you don't want the relationship to end; you want to spend the future with him.
Are you sure?
Are you sure that you want this man who used to phone prostitues, who likes girly pictures, and who has already had sex with other women?
If you are sure, and you want this to work out, then you need to address the problems, not ignore them. That won't help ~ they will just keep re-surfacing, ruining your relationship.
You can't stop feeling jealous and upset because this matter hasn't been dealt with.
You want to know more about this man ~ you thought you knew him before, but you didn't know the full story.
You may want him to delete the unpleasant e-mails and get rid of the bikini girls.
Maybe you want reassurance that he only slept with girlfriends, before, and not with escorts.
You may want him to promise that he won't lie to you again ~ even if he thinks that you wouldn't want to know the truth.
You may want him to show that he is willing to discuss matters that are important to you ~ if he had done this, and the matter had been dealt with fully, then you might not be feeling as you do now.
If he is willing to discuss the whole thing openly, so that you can attempt to get closure on something that has shocked and upset you, then you may find that things improve. I don't think that the feelings will go away until you have really talked this out ~ and, even if you were to stop vocalising them, they would still be there, tearing you apart and destroying your relationship.
However, since you both seem to think that your feelings of jealousy may be more than might usually be expected in the circumstances, and you have been through traumas before, it may be that you could benefit from counselling.
Indeed, you might both benefit from relationship counselling.
If you don't want to lose him, and he doesn't want to lose you, then you should be able to work this out. Love is a wonderful thing, but jealousy and unwillingness to discuss emotions can give it a really hard time.
Is there any way that you could spend some quality time together, so that you can talk ~ frankly, objectively and openly?
These are just my thoughts. I may have got things completely wrong. What do you think?
Good luck!
I was only jealous with 1 boyfriend before and i later found out that was because he had cut a whole in his condom and i was pregnant and hormonal (i had a miscarriage before i knew i was and he told me) I NEED to stop but i cant get the feelings to stop or me to stop vocalizing them (i feel like im going 2 explode if i dont) the feels i think might be because i have been cheated on and betrayed many times in the past and now that i have found someone i truly care about its coming back to haunt me 
PLEASE HELP I CANNOT LOOSE HIM!!!
