Has anyone ever experienced this in a relationship? Please help!?

Oh hun! I think you should be proud to have a guy like ya got! I also think that you should take it as a compliment that he gets so nervous when he's around other people in your life because he's only being that way because he wants so desperately to impress you and make them think that he's good for you. If it's a major concern just talk to him and ask why he gets so nervous around other people and tell him that no matter what anyone else thinks of him you love him and he shouldn't be so worried about what they think of him. As far as the jealousy thing goes, I'd say that's also a good thing--as long as it's not excessive. Every person in a relationship is gonna ask questions like that and they might ask them again and again just to make sure. When he gets like that let him know what a turn on he is and how you wouldn't want to be with anyone else because he has what you want. It sounds like ya got a good thing with this guy, except that he's a little insecure. So if he's worth it just build him up when he's nervous or jealous or whatev and then he might learn how to act more comfortably! Good Luck with everything!