Anyone have any good advice for what I'm dealing with?

So, been back and fourth with this guy for 2 years. Yes, I mean in and off and the reason we have always fell off is because of me. I sometimes feel as though I need attention a lot and when he wouldn't show me much, I would shut out. I'll also admit during the time I stopped talking to him I was talking with other guys, trying something new, and it never was what I wanted or needed. He has never tried to leave me alone he never talked to other women, and I really care for him. Now we have been back for a little while now and it's kind of hard BC I know he cares and loves me but the kind of guy he is, he would never allow me to know it. & I know it's due to things from his past, so when I tell him I love him and what not he says "stop lying or quit playing lol" & I'm not playing, he'll also say "I'm just waiting for the day you leave again bc u always disappear" but I'm really not leaving I love him and I want to be with him, but I just am out of ways of showing, like how do I get him to know I really do love him, what do I say????