Most Helpful Guy
As long as you are giving the whole story about what happend and what you did involving the kissing, then I think your ex needs to get over it.
You were at a party, where an old friend got drunk, and then he kissed you, then you backed away. That's not cheating. That's someone taking there advance a bit too far, and you stopping it,... and kudos for telling your man.
I can respect your ex's issues though,... being that this best friend is a guy, that you probably still hang out with him, and now, obvisously when you are haning out, you need to stay sober / aware enough to keep things from happening,... that's a little disconcerting.
If you are really wanting to be with this guy, you need to have a serious talk about what happened, what is happening, and how you both feel. You may also need to make a difficult decision about your best friend since advances and outward statements of affection are going to be atom bombs to any relationships that you are in. If you truly have no feelings for this best friend, and he can't respect that and put his aside, perhaps you need to make a split.
Best wishes.1THIS IS NOT RELEVANT ANYMORE