<human>: Hi guys, I just want to thank you for spending your time reading my question. Well, the back story is that a close friend of my girlfriend's has been saying things about our relationship, things that aren't so nice. Given, he's in a vulnerable place after breaking up with his own girlfriend, he decides to tell her that I am a cocky douchebag underneath my mask, that's in it for the sex.

Number 1: I've only spoken to him once, and when I did I tried my best to be friendly.

Number 2. I honestly have not done anything to him or anything to even effect his life in any way.

So Reddit, I was wondering if I should go have a talk with him (it won't be the friendliest talking considering he rejected it before) or just ignore it? My girlfriend says she would talk to him again and maybe work things out. But honestly, I don't like the fact that he doesn't even know me, but somehow has the courage to say something like that about our relationship?

Can you summarize the given text in a few sentences?
<bot>: guy tells my girlfriend I'm not right for her without even meeting me, what are some effective choices I have to deal with this guy? Oh and my girlfriend and I are in a long distance relationship.