First, don't write in turquoise, it's hard on the eyes and some of us are old.
Second;
the person I'm dating I like but not much
Not much going for you then, is there? Why are you staying with a guy that you like, but not much?
Should I sty with him or leave him for the one I love?
Love? How old are you? I'm going to guess 13, maybe 14, because of your writing and the way you posted. So, having said that, you don't know love yet, and won't for some time.
If you want to date someone else then break up with the first guy and move on to the second. It's unlikely that you'll end up with either of them for the long term anyway.
Good luck.