Boyfriend problems..!?

Ok, so my boyfriend and I have been dating for about a year and 3 months and I am BORED! He is very sweet and nice. He opens the door for me, my parents like him, and he does everything a boyfriend is supposed to do polite wise. He is a mommas boy and he is booming in his career but the love is just not there anymore. We don't kiss, we don't cuddle, we don't have , etc. The closet we got to was holding hands and a little peck and nothing else! So, 3 weeks ago we went to this really nice, you had to be dressed to the 9's to get in and the whole time he was on his dumb PDA doing business! So my ex was there and he was looking good and all the feelings i had for him came back! we talked all night and we left on his motorcycle and we slept together. I didn't get back until the morning and my boyfriend wasn't even looking for me he said he thought i was at my sisters house. On Thursday my ex and I went to Atlantic City and my boyfriend called and asked what I was doing I said I was in Atlantic City and he said "oh ok have a nice time call me when you get back"He is a really sweet guy and I really want to end this relationship because doing stuff behind his back isn't the way to go. So what should I do. I don't want to break his heart too bad.