the way i look at it, she is not being a good friend to you. she is telling you that she may not forgive you because YOU almost ruined HER relationship??? sorry if this upsets you, but with friends like that, who needs enemies? in the future, what else will she be able to do and then turn around and blame you for?
just be careful, if she will do it to him, (basically cheat), she will do it to you, (lead you on)... both of which were her decision, (it doesn't sound like you forced her) i would be pretty leery and take it very slowly. she made her own bad decision and has put the blame solely on you. deception can be a destructive thing. i see no harm in being friends but i do see harm in deception. the rose idea is very, very nice, but why would you chase her when she blatantly blamed you for something she did? please be careful ok?