Thank you all for your answers. Yes gt66 there was a gut feeling when I asked him to drop me at a friends house so she could take me to work. He was quite happy to drop me at 6:30 am, then last minute he said he couldn't and had to drop me at 6:10 am. A couple of months ago he would not have let me wait on my own. I challenged him but nothing....
Back story with ex. He still has money issues with his part of the house, so solicitors are involved. He is pretty angry with her (so he says) but this too has been going on for 3 bloody years!!!! He won't move it on, he just dithers.
One evening when I knew he had been there, I said, "You smell of fags, and she smokes. So have you been there?" Even then, deny deny deny. He never explains - he just says nothing, or lots of houses I go into someone smokes. Not true. I only have smelt it that once.
I actually am past caring if he goes there as long as he is honest... sometimes it is just for 30 mins!!
He could be visiting the same neighbour, its possible, but then just tell me!!! I don't care! I actually trust him! That's the stupid thing!
Also there is the problem of where is he going to live? I would basically be chucking him out. Oh God its such a mess