During the span of when my GF and I were still talking, she often told me about her ex-boyfriend (many of the discussions included how he used to yell at her, etc.). I met her ex' once...well actually, I confronted him and introduced myself outside at a pool hall to make sure he knew who I was...at that point, my GF had told him that she was talking to me so he did have an idea (he wouldn't do shit to me 'cause of the heads I rolled with as well as my homeboys already inside...hell, I bet he wouldn't do anything at all if I went by myself). He actually kicks it with some of my other homeboys although some of other homies don't like him due to the fact that he's attempted to start some shit with them in the past. Quite a number of times when my GF and I are just chillin'...she gets calls from him (not that she picks up). I know I shouldn't act like this, but my question is - is it natural for me to automatically dislike him due to the fact that he's my girlfriend's ex'? Many times, I really desire for him to talk shit to me so I can beat his ass legit (or get his ass marked). Thoughts?