I'm 36, have a reationship question

I’ve been with my BF for 10 years. He is 15 years older than me. He’s always been a party guy and that eventually led to being out of work, now for 3 years. I haven’t felt happy with him for a long time. I have been carrying everything, all of the bills and responsibilities.  I have realized lately that I cannot see a future with him. I love him. We have many years together, but he’s got no retirement fund, no current job and basically no motivation. All of this pent up nonsense has lead me to cheat on him. I think I did it to feel things out for myself by finding out if I felt guilty, or only wanted his touch etc….Well here’s what happened….

The new guy knows the whole situation, he’s 38. Sexy, smart, fun and has a great career. He knows that I cant toss my BF out because he cannot support himself right now. We have been together 3 times. I am CRAZY about him. I know him since we’re kids, we were supposed to go out 10 years ago when I met my BF , so we never did until now! I absolutely love being with him, texting him , talking to him etc……so the big question  is Wha should I do? I can’t break up with BF now and I really want to keep seeing the new guy. He’s OK with being “the other guy”, at least for now.