So my ex recently started talking to me again and we've kind of been hanging out. We've been on and off for like 3 years since we broke up. when I asked why he always comes back to me he said "I like to come back to things that make me happy". I feel like he just wants a fling but then I really don't know. He's so confusing, I don't know if I should walk away or wait it out and see where it goes. Any advice ?