Loving two people at once

I've been in a relationship for a year now and everything's been fine. But I dunno if cause it's my first proper relationship I feel I love him. But 2 months ago I slept with a guy from work he is so nice charming a true gentleman. We have a close friendship. But lately my relationship with the 1 St guy has got me feeling really small. He never smiles when we are out. Isn't publicly affectionate. Everything is his choice he decides how long we stay out etc Never says thankyou etc and I'm just fed up but when he found out before I cheated he was crying and that made my heart drop.  But last night the guy from work came over we got intimate took things slowly and he stayed. He made me feel so happy. So much happier than I've been the past while I just don't know what to do. He wants me and I want him but I don't want to face telling my current partner and ending things as he gets upset. His family is so nice and he is. But with him I just feel I'm getting used for sex and when he is bored. He won't come over some times cause he'd rather play his ps4. Where as the guy from work will go out of his way. It's just the little things. The nice comments the guy from work gives that my current partner doesn't.  I need help and advise. I know it's wrong I cheated but what next. I saw this quote which made me think.