Once trust is gone, it's extremely difficult to build up that side of the relationship again. You tend to still wonder if they're playing around, that suspicion may go away in time and although you may have forgiven, it's difficult to forget in some cases.
Long distance relationships can and definitely do work. A prime example here is of our men and women fighting in the wars.
At 20 she is still very young and as has already been said, somewhat immature to be acting and behaving in such a manner. Yes it was a special night but then was there the need to grope a guy that way? That was uncalled for. Were the tears genuine or because she'd been 'busted'.
You sound as though you're more mature and my advice would be don't give your heart away just yet, you have many years ahead of you to fall in love with the right girl.
If this is in fact true love, it will stand the test of time and distance.
