Have a bf, falling in love with someone else

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Hello. I'm 21 and I have a current bf. we've been together for 5 years and I love him so much he always makes me laugh, but there is another side to this. He has done alot of things in the past to hurt me, abuse, and drugs. Recently we have been going to church and meetings for 6 months he has been sober but last night he never came back home.. I was devistated. I know he's not cheating on me, but he was out doing drugs and I told him I wouldn't stick around for one more chance if that ever happened. I'm afraid if I leave him the worse could happen- he could loose his faith...start doing heavy drugs overdose or kill himself. He is not very stable he is 28 and still lives with his parents, but he does work. The other man I met online, I've known him for a year and he is very sweet and seems to care about me. We've been in an intimate relationship before and he knows im with someone he knows my story too. I was really depressed so today he came over and took me out to go and spend the whole day with him and I havn't had that much fun in a long time. He makes me laughs, always holds my hands, he looks at me with love and smiles alot at me.. we've talked and he is divorced for 4 yrs... he has 2 kids a single dad. He seems more stable then my current boyfriend.. and I know im falling in love with him but do you think he is falling in love with me too? What do I do in this situation? Who to go for?