I've recently started seeing someone. He's exactly what I'd look for in a potential partner.
One slight issue is his ex girlfriend.
She works for the same company as him, she relocated from the North down to Midlands for her career then they got together a couple of years back and he said it moved rather quickly and they bought a house together... they split up a couple of months back and as far as I was aware, he was and is completely single and that they are just friends.
His ex girlfriend half owns the house with him, and from whenever I've been over, there is no signs of female cohabitation as she has allegedly left the house and is renting elsewhere. No women's clothes, no female toiletries, that sort of thing. The only thing that I noticed was a hand-drawn picture on the fridge dated around Christmas 2016 from a young child related to her.
He's apparently moving back to his parents temporarily whilst she moves back in this week as he doesn't feel it's fair that she has no family or support and has to rent whereas he has all of that on his doorstep. Oh and he kept the dog too. He asked me what I would do in that sort of situation, and I said I'd have a conversation about buying her out or selling the house. He agreed.
He cancelled his plans to see me tonight. He's also messaged asking if he can see me at mine this week instead of his, so I'm presuming she's already back at the house. I asked him and he avoided the question, which is what has made me suspicious.
I don't know whether he's being completely honest about their relationship, or if it's just an awkward situation and I'm being paranoid. I don't know whether to ride it out for a couple of weeks to wait and see whether anything comes to light.
My ex's have ruined my trust in people due to being unable to keep it in their pants and feeding me lies. So I don't want to ruin something with potential due to me being paranoid 
WWYD?