Bf cuming in me and not telling me!?

So today my bf was doing me doggy style for a while and he suddenly slowed down then stopped while still in me, I thought he had just gotten tired so I moved out of the position and when I did and his dick came out, a lot of cum ran down my leg. I asked him if he came in me and he said no, I said was that me then? And he said yeah. But I didn't feel like I did. In fact I know I didn't unless I was just that juicy. Even when I do actually cum it's not like that. I kept asking are you sure you didn't cum in me and he started mocking me. I would be so pissed if he did that makes me wonder how many other times has he done this or will do this. Even worse to think that he would find it okay with lying to me. I am on the pill but I would still like to know if he did or not. Then he decided to half ass eat me out and go in the bedroom to take a nap so thats all more the reason I think he did. I followed him in there and we fucked and he came pretty fast so that kind of contradicts it. Idk.