I dun know whether im in luv with my bf or not.we ve been together for 2yrs nw.dun wana hurt him!?

You should make up your mind for this issue. You're the one who started all these and now you're feeling guilty for your bf. If you don't wish to hurt your bf any further, pls break up with him. You've been a selfish girl. You want the best of the of both worlds? That's too much. If you like F, just break off with your bf and see how it goes between F & you. But my guess is that F will return back to his gf and you'll all alone in the end. That serves you right for your greediness and betrayal for your unfaithfulness. Every yearns to have a gd bf, you've it but you choose someone who irritates you and makes you laugh. Coz humans are cheap. Think about it. You're not the only one hurting. Eventually, it's your bf who will be in pain.