Girlfriends good friend is in love with my girlfriend
Hi, I have a bit of a problem that I need some advice with.
I have been with my girlfriend for about 5 months now and we are very much in love and plan to move in together if we are still together after a year or so. Last night she told me that she thought we were perfect for each other and hopes that we will one day marry because she feels I am the one for her and couldn't imagine life without me or see herself with anyone else. The problem is her guy friend who is deeply obsessed with her and thinks he loves her. He doesn't have much friends and has a lot of problems at home (parents arguing, grandparents passing away etc) and my gf is really caring and has been there for him but he has seen her kindness as something else. I have brought it up before but she has told me they are just friends nothing more and it ended up in a big stupid argument.
I'm not the jealous or controlling type but recently he has put on his tumblr that they are together and wished they were cuddling together again which has angered me but I don't know how to address that im unhappy and not comfortable about this to my gf without ending up in an argument. The fact she is going to see him this weekend just makes matters worse.
What should or can I do? Any advice is greatly appreciated