Is it normal to like younger guys?

I use to have a good bf like that for 3 years from the age of 17-20 :/ and he cheated on me with multiple girls...and I caught him in the act and slapped him across the face, it was the worst feeling in my life....I still think about it today, and my recent bf doesn't even do that for me, sometimes i feel like he doesn't deserve me, :/
I'm way to sweet I think...

but Gahhhh don't take this the wrong way but you seem really nice ^__^