I really need some advice :(
So my ex boyfriend sent me a message on facebook today. It was this huge paragraph of him saying that he wants me back. He's a really nice guy, we never fought or anything. We were going out for 4 years then we broke up because we were going to different schools and we didn't talk as much (the school was literally 20 minutes away from my school) We were still friends though, we hung out when we could and after two years he sends me that message.
But I don't want to get back together and I don't really have a reason, I just don't want to. How do I tell him nicely?