I don't know if I want my ex back..?

You're wanting him as a time filler when you have nothing better to do. You're missing the routine because that's what you know. What's the point of being with someone just because you can be? There was a reason why you broke up with him. He's your ex and he's part of your past now. You need to keep him where he belongs.........in your past! You're not being fair to him either.