obsessive

So I feel like I'm a little obsessive with my boyfriend and I don't know how to not be. We've been together for three years and I never want to do anything without him. I don't have many friends but when the friends I do have ask me to hangout I usually find an excuse to turn them down so I can hangout with my boy. When he wants to hang with friends I get sad and we end up fighting about it and then he doesn't go and I feel guilty. How do I stop being so obsessive and enjoy time with other people besides him? Please help!😫