So there's this guy that I've known for a while now. When we first met, he was like my best friend, always there for me when I needed him, and he always gave me the best advice. I tried to keep it that way because I know that he's with someone and they have a family. I've actually done my best to keep him at a distance. But over the past year, he's trying to get closer to me. He will go out of his way to make sure I'm okay, offers to fix my car for me(for free, even though the repair was almost a thousand dollar job at any garage), and constantly comes to me whenever he has a problem with his relationship.
I'm in a relationship as well, but it's kind of complicated(and open, so my boyfriend doesn't care about the interactions I have with this guy), the guy is extremely jealous whenever I bring him up though. I can't ask him for any advice regarding my relationship without him calling my boyfriend names. My problem is that when I try to talk to him about anything involving the two of us, he always gives me the generic "I love my girlfriend" answer. I don't know if that's because he actually does, or if he's trying to avoid any conflict because his actions with me say different. I really don't know if I'm over analyzing this or not, it just feels like something has changed between us and I can't put my finger on it.
I know his girlfriend has a problem with me, she's told my friends that she's worried about how he looks at me differently than he does her. That she sees me as a threat, but the way I look at him isn't in that way(at least I don't think it is). I don't want to be a threat to her. I just don't know what to do anymore. Should I sit him down and talk to him seriously? Or am I just crazy and this is absolutely nothing?