What a shame you’re in such an awkward predicament. I’m guessing by now you’ve figured out you’re not really in love with the guy. You might have thought you were before, and I guess you were hoping for a love story with a happy ending, but that doesn’t sound very likely.
I sure hope you used protection. And I hope you’ve learned enough from this experience to know in the future how important it Is to talk with a guy and get to know him before sleeping with him. At least find out if he has a girlfriend or not.
A guy who cheats on his girlfriend is not a guy worth having. If he cheats on his current girlfriend, he’d probably cheat on you too even if you were his girlfriend.
Do I think he loves you? Sadly for you, no I don’t. I doubt the guy loves his girlfriend either. I suspect he’s chasing physical contact, not emotional involvement.
So I think you should view this encounter as a life lesson to help you make better decisions in the future. And I think you should tell your friends you made a mistake and will be more careful in the future. Ask your friends to help you feel better about yourself because I’m thinking you need their support right now.