My boyfriend and I have been together for 6months. Both of us have dated people but we are both each other's second real boy/girl friend

my x and I are friends we have been friends for 2years. We were best friends before we dated. Recently the x came into town and asked me to go out for a drink. So we did. I told my boyfriend that night that I did. He asked some questions but took it fairly well.

Going into this I kinda knew he would be upset but I didnt think it would all go wrong, however it did. So the next day he flipped. He's not the kind to be like you can't ever see him again, he says he's just "disappointed" is there anything worse?

So we went to a movie that nite and as we were leaving my x walks out of the same theatre with 2 of his friends, what are the odds? So my bf (boyfriend) just got even more mad.

I know I am not all right but I don't think I am all wrong either. It's not like I tried to hide it from him and it was just drinks. Also its not like this was the first time in 3 yrs that I have talked to my x we have been friends for 2yrs after a year and half of not speaking, we both have moved on and we are finally able to be friends again.

So how wrong am i? And how long should I let him punish (i don't mean it in a slave way) me?

Please help!