"She says" means that he doesn't know. He doesn't remember. That's the part that messes with roofie victims' heads. That's why when I woke up after being roofied, I had to go on a full regimen of STD medications, because I didn't know if there had been a condom involved. It's why I still don't know how many attackers I had (it was more than one, but they don't know how many it was). It's Becky's word (which, in that she was willing to roofie someone, has no real credibility) that she didn't sleep with him. He doesn't know - and the not knowing is worse.

Furthermore if she didn't consummate the marriage, what was that whole scene with the lingerie about?