RELATIONSHIP ADVICE HELP ME!?

My Boyfriend since last August is in the ARMY. He leaves Next Month for 400 days. We started dating in College so we are from different places. Over Christmas break we werent really getting along or talking much, and he ended up cheating on me. I didn't find out until February when she said she was pregnant. On New Years he made sure that we were in the same place as his promise for a new start with us. So I agreed to be here for him, because i love him and because he has doubts that its his because he knows she gets around and he used protection. Anyway we have been great ever since the committment to stay by his side through it all, only to find out that there was another girl who is the same along two days ago. Now coming from him he's begging me to stay, saying that he loves me and he knows he messed up, but he hasn't done anything since then he swears. we had plans on getting married, and the hardest thing for me to do is be without him. He is going to need support while he is gone, and I told him I will be there for him but until we find out the truth about this baby mess, and DNA tests come in. I don't want to continue to get closer to him. I could handle one child but two? and we have none...i can't do. I want to be there for him, but he says that if i can't be with him there is no need in wasting time, because it would hurt too much, and he would rather me leave if I am going to do so now. I am dying because the answer seems obvious. But neither one of us wants to be apart. and this one day is killing me softly....HELP ME PLEASE!