Like vs. Love

I have a huge dilemma. What do you do when you start liking someone else while separated from the one you're in love with? Then, when it's time to go back to where you belong, you risk hurting the one you like...i don't know if this sounds confusing but hopefully you get the point. I'm supposed to think with my heart and not with my mind but it's hard to differentiate between the two at times...i have no idea what to do...but time will tell.