You can tell by asking yourself if there is any reason for him to fake it.
Yes, guys will sometimes feign affection just to get in a girl's pants. But your guy is already in your pants, and visits the Cave Of The Seventh Wonder on a semi-regular basis, so scratch that as a motive. Could there be any other reason? Does he want sex more often? Does he need money, a ride or a place to live? Did he recently start taking an SSRI or SNRI?
Chances are the guy is developing feelings for you. Some people seem to think that's not possible, that all guys are emotionless humping machines who can be intimate with a woman for months or years without growing more attached (for lack of a better word) to her. That's a ridiculous notion. Some guys are droids, sure (as are some women). The rest of us are human just like you -- the more time we spend with you and get to know you and let you get to know us, the more fond of you we become. We sometimes even -- gasp! -- fall in love.
Unless you have a good reason not to trust your guy's motives, take his affection as genuine and enjoy it -- that is, if a deeper relationship is something you want. If it's not, I suggest you let him know soon before he gets hurt. That's right -- hurt. It happens.
You could always just ask him, too, especially if you're into the guy. Then you could both be into each other, keep boffing each other but also fall in love and live happily, hornily ever after.
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Great answer Cary! When I hooked up with a guy almost a year and a half ago, I was falling for him, but in his world we were just FWBs.....flash forward to April, when he went on vacation, and realized he couldn't stop thinking about me. He returned and told me that he'd been a fool and had been in love with me for a while. We've been happily together ever since! :)
"For lack of a better word"---*snicker*
Ahhh...see, you just made me fall in love with your answers again. Thanks, Cary.
"... and live happily, hornily ever after".
Yeah! I like that ;)
Ahh, I know exactly how you feel! I developed feelings for my fwb after a few months, and kept driving myself crazy because I noticed he was more affectionate towards me... and after wasting too much time trying to decode his actions, I just told him I liked him, with positive results! And then about two months later, he told me he loves me!! Cary's right... he didn't have to act that way to get in my pants, and that was what made me go for the "feelings" talk in the end.