Oh wow, that sounds very stressful and sad for you. I am so sorry you are going through this, it is no fair at all. Well, I personaly feel you schould definitely NOT get back with him. Stop taking him back, he is just an ass whole that acts like he loves you when he wants sex. He sounds like a major jerk to me. For one, since he is seeing another girl behind your back, that shows he is not loyal and committed with you. You need someone who you know will always be by yourside and your babys side and that you know will never leave you. You and your baby deserve the best. Please dont let your feeling of not wanting to be alone take charge. Just know that you can do better and will eventually find the man that will treat you with the respect you need. Also you dont want your child to be around him, because you will never know when he will just walk out of you and you kid. You dont want your kid to never know if his or her dad will come back. I hope I helped hun. I am truely sorry.
-heather