What should I do?

My boyfriend of 5 years has cheated on me 2 times that I know of and each time I have taken him back, after 2 kids I found in his cell phone that he was talking to two females on the phone, late at night and times when he is supposed to be at work. When I confronted him about the situation he lied, after a few days of arguing and fighting he told me that he just talked to them on the phone and he didnt sleep with them, but we both know that was his intentions and I just caught him before it when to that next step. I talked to one of the girls and she was grown enough to just let me know what was going on instead she wanted to be a ghetto hood rat and talk crazy through text messages, the chick wouldnt even answer her phone when I called her. and the funny thing is, she has a boyfriend. so why is it that my boyfriend, father or my children is talking to a female who already is involved. doesnt make any sense. So we lived together and I recently moved out and asked him not to live with me and I did not give him a key, and I told him that we were done. now he wants to tell me how much he loves and wants to be with me, but did he love me when he was sneaking around calling these chicks? NO NO NO I DONT think so. He has been calling and texting everday since the split and wants to be a family again and come live with me and the kids and I dont know what to do. I have loved this guy for 5 years, we have been through so much, and its hard to maintain with two kids alone. but what doesnt kill me will only make me stronger, but what should I do?