I'm going to tell my girlfriend that when her gay friend tried to kiss her he was trying to steal her from me.
Does your girlfriend need to know about her friend's motivations from you?
Yes, because he is sneaky and cunning with her and I don't like it.
Let your girlfriend handle the situation first. It is her friend and she will know what to say and what his motives are.
I know but I don't like him because he is a homosexual and I think he is disgusting.
Him being a homosexual is not a valid reason to hate him. You are saying very hurtful and discriminatory words. Do not say that about him.