Advice

So I've been talking to this guy for about 1 month, we've already had sex and it was amazing but we established that it wasn't going to be anything serious because he's going thru a divorce and doesn't want anything serious right now, he told me that I'm the only girl his having sex with and talking too, but I'm not sure I believe him and I don't know if I should question him about it or just  go with the flow and see what happen?