There’s this one guy who would not stop pulling my girlfriend aside and saying things like:

“Let him go” or “he has nothing to offer you” just disparaging me to her or trying to make her have doubts about me

things of that nature

We would be having private talks and he would be openly trying to listen and get mad just because we spent time together.

I’m just trying to figure out the motivation there because I never understood. I just thought it was such a petty and mean thing to try and do to me.