Are you sure this is the right guy for you? I would also have a problem if my boyfriend hung out with people who were snorting coke and cavorting with prostitutes... but you can't really tell him who his friends are, you can only decide who you want your friends and lover to be.

It sounds like getting out of the house and around other people would be good for you and might dampen some of the urge to control. If you had an active social life and were busy when your boyfriend was playing tennis, things would be okay, right? I think it's natural that we get a bit clingy when we rely on only a few people for our social needs. I know I'm that way.