I'm married with 3 kids. I've tried everything to make my marriage work. My husband and I have be paying bills. The issue is that, I've caught him with countless messages from his girlfriends. I was really disappointed. Though I try to forgive him and let this marriage work. When he didn't stop and he stopped making love to me. I'm not happy in my marriage then my ex came back to me. He wanted us to come back. He want to take me as his wife. I'm ready to leave my husband but I'm not sure its right. What do I do?

you have 3 kids involved in the matter... choose wisely you can't be going from guy to guy when you have kids. Its not right you are in a relationship like that, I'm sorry =[ but before you think about getting into another one ask yourself a few things: can you afford to take care of 3 kids be yourself for a little bit?
are you mentally and physically ready to start a another relationship ( one with od history, seeing that he is your ex)? And last what if the next guy you go with cheats on you how will this affect you and your kids?

my advice, think of your kids first. If you are able to manage your kids and yourself for a little bit then do it. Take things slow... very slow

Before you leap from the frying pan into the fire, do some serious memory searching about why you left your ex in the first place!
What country are you in? Can you divorce your husband and get child support?