I agree with GG. If you're sleeping with someone, you're going to like them and have fond feelings. Your brain produces lovely, powerful hormones that make you go, "Wowza, this person makes me feel good, and they're pretty groovy." Congrats; you're normal.
If this is a guy who can't take a simple pat on the hand with a, "Hey, I think you're a really great guy, and I care about you," then he's possibly not the right guy for you, or for polyamory.
“Edit yourself, bitch. Edit yourself.” – Chad Michaels