Bf insecure

My boyfriend was cheated on by his last long term girlfriend and is always concerned about me communicating with other guys. This has caused fights because Truthfully I don't have the energy to put up with it, but he is a wonderful person with a huge heart and would do anything for me despite his jealousy. But everytime he sees me interact with a guy he doesn't know he gets insecure and we fight because although he claims to trust me I don't think that's true. I know it's not healthy and that's what I fear because all other aspects of our relationship are wonderful. I just wish I knew how to help him with this.