<human>: So I messed around with my best friend of 5 years at hear house.

 It was more than kissing, and it's not the first time we've done it. 

Well this is the first time since I started dating my current boyfriend, or ex now..

I can obviously see why he wouldn't want me messing around with another guy, and honestly, I would NEVER do that to him.

 But I didn't think that he would get upset over me messing around with my girlfriend (girl that's a friend).

 When he found out, I've never seen him that mad before.

Totally came out of nowhere,.. I mean, shouldn't he like that I messed around with another chick? 

Most guys do and we've even talked about the possibility of having a threesome sometime.

 He knows I care about him, and knows that I wouldn't try to hurt him on purpose.

He looked confused and hurt when he broke up with me and yes I feel bad, but I just don't get why he took it so hard? 

How do I convince him that I didn't mean for this to hurt him?

Can you summarize the given text in a few sentences?
<bot>: I messed around with my female friend. My boyfriend got upset about it and broke up with me, totally out of nowhere. I don't consider this serious AT ALL and he went ballistic. Need advice on how to resolve this.