You don't really love him. You like him, and you care about him and you appreciate that he's nice, but you don't love him. Your subconscious is looking for an escape and there's a part of you that wants to get caught so that you will break up with the current boyfriend. You're also fighting self esteem issues because you crave the attention of other boys/men. I would recommend seeing if there's a family therapist/counselor that you could talk to (who is obligated to keep things confidential), so you can explore your self esteem issues and find true love. You're on a destructive path that needs to end.
Tell him
Offer to let him watch, he might go for it.
Pack your shit and leave. Tell the man you need more dick than he can provide and you just love cum in and on you. I would suggest you become an escort and get all the fucking you want and get paid for it. Oh, that would make you a prostitute wouldn't it. Oh well, that would work too since your already a whore. My kinda girl.
It's normal, at least for a cheating evil woman like myself. I do the same stuff. I'd be happy to talk to you about it and share stories if you have yahoo messenger. Message me on there, my name is jennytime212