Okay, I'll attempt to keep this brief even though I could write an essay on everything that's happened. Also, before I say anything, can I just state that I'm not usually the sort of person to start these types of threads? Usually I'm really quite decisive and have lots of family/friends who can help me weigh up pros/cons. I kind of need people who are impartial to help me with this though so any replies are greatly appreciated!
Basically, I've had this on/off 'seeing each other' thing going on with a guy for around a year now. I'll bullet point events to keep them easy to read

Sept
- Broke up with his long-term gf and went on a date with me just before I left for uni
- Both decided to 'keep things casual' (this isn't very 'me' but I decided to give it a go) as it was long-distance
- He decided he wasn't ready for a new relationship and called it off
- Got back with his ex
Xmas
- Broke up with his gf - said it was a mistake and totally over now
- Spoke to me A LOT whilst at home
- Nearly progressed to 'seeing each other again' but not quite
Easter
- Slept together and saw each other loads
- He still wasnt ready for a new relationship so said he'd rather be friends
Summer
- Saw each other a lot over 2 weeks
- I told him I couldn't get involved with him again as I always get hurt
- He said he was only trying to be mates by seeing lots of me and talking to me loads and that he didnt want anything more as he still wasn't ready
So, I got over it - have hardly spoken to him whilst being on holiday and kept things really cool. Went out with him last night and he was saying he still has feelings for me and has changed etc. So I told him it wasn't fair for him to tell me that and he was like 'okay just being nice'.
Right, so my question is: Do I send him a message explaining how I'm feeling? My logic is telling me to steer clear as I'll only get hurt again and we're better off as friends, but the rest of me is wondering whether we could make a proper go of things now, if he's really sorted his head out...
Shall I message him and tell him what I'm thinking to see what he says? Or do I go back to uni wondering if we could have made it work this time?
Thanks guys! xx