I kinda went through the same thing a long time ago. One of my best friends went through a self-destructive period for a few months, but refused to tell me what was that had him so depressed and angry with himself (at this point all of our closest friends and my girlfriend already knew what was happening with him).
When he finally told me that he had fell in love with my girlfriend and all the self loathing came from believing he had betrayed me all I could feel was relief. I told him that I did not feel betrayed at all, after all people do not have agency over their feelings, and from that point onwards, he started to get better. I was angry with all of my other friends and girlfriend that saw him suffer but did nothing and just tried to wait till his feelings disappeared or he finally finished his life.
You are overreacting, but it's understandable.
You overacted about shit u give a fuck, you give a fuck about your relationship and u give/gave a fuck about your friend.
Your GF dismissing it as something minor is a dick move, either she doesn't care enough about the situation or finds the attention from the dude flattering.
Either or, it sucks.
People with the same psychological problems like your buddy , can't get their life stable and under control. That also means jealousy about good relationships. But he would not do this to foreign people. Of your girl loves you, then it is fine and no problem, right? You both know about his problem and handle it like adults, I hope
Context, and he can be in love with her, and since he told you before acting upon it, might be a good sign. Also, whether your gf is responding to him or not.
If she is wonderful enough for you to care about her, does ut not makes sense that others might as well? All that matters is who she is with and how she responds to others showing her adoration. If they are ignored or she indicates that she has no interest in return, then good. She doesn't have to be mean about it. If she allows more of the attention and makes it clear she enjoys it, then not so good. As for him (and anyone else) he maybe can't help what he feels and might tell her but a real bro won't ACT on those feelings.
Anyway, you definitely are overreacting. If people suck, cut them out of your life and be glad you'll be better off for it. Better to be alone than surrounded by fake assholes.
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