How do you know if a guy's faking it?

I hooked up with this guy the other day after a party at a friends house and we were both pretty drunk and he invited me to his place. We made out and I went down on him and he fingered me and when we were having sex he kept breathing heavily and making sounds and he lasted for about a minute until I think he came but I'm not sure. I didn't see him take off the condom but he just fell on top of me and rolled to the side with his eyes closed. He kept telling me I was good at head and asked me if he was good. And we just made out for a while and talked. He took out his phone and asked for my number and I gave it to him but accidently deleted my contact. He ended up walking me to the bus stop a little while after and I told him we'd probably never talk again but he said we definitely would. What do you guys think?
How do you know if a guy's faking it?
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