As hard as it may be but you simply have to walk away from a guy who is simply not that into you. He keeps you on the side as though youre his plan B when all else fails. You're available for him and he doesn't have to do any work to keep you around bc knows you'll be waiting to take him back. He simply doesn't respect you and you need to start respecting yourself so that you can move on without him. He's shown you over and over again that he's not here for you in the long run. Don't hold on to him to determine that you can change his mind that you're worth to keep. People can't control other people. Its heartwrenching to experience such a thing but for the sake of your future you need to move on from this type of guy he's toxic for you.