Thanks @ibelieveinmirrorballs and @Stepcount.
There is no way back,its definitely over.
I thought it was a possibility, he'd hurt my feelings on Sunday which I told him and he appeared to accept what I said.
Over the last few days I had some niggling doubts about Sunday so wrote some questions down to ask him so I could be more at peace with what happened (and make a decision).
On Sunday there was a local music event that I went to alone and Mr K was going with his son, I guessed he might also meet with friends.
At the end of the day I saw him (a miracle as it was so busy) and he was with a friend and no sign of his son.
It made me feel awakward/sad/pissed off. I didn't feel I could go and speak to him as I didn't know these friends and it felt like I'd caught him out.
The next day I asked where his son was and he said his son hadn't wanted to go so was dropped home and Mr K went with his mates. I asked why he didn't think to message me to ask to meet up as he knew I was going and he said he didn't think and anyway him and his mates were hanging about drinking and I don't do that,I told him just an hour together would have been nice as we like different music but just a bit of time together at an event would have been nice.
So it's escalated from that to ending things, he also brought up LAT and how he wants to live with someone in the future and that's not possible with me.
I'm ok about it, what will be will be.
Neither of us have had much spare time for the relationship and we've been loosing the connection (something I raised last year and a few months ago and he was adamant things were fine).
The cynical side of me thinks he didn't like me raising a concern about his priorities and he knows he can't/won't give more so it's easier to end it than deal with a 'demanding' girlfriend