Confused

My husband of only 1.5 years (we've been together for 8) told me the day I returned from Afghanistan that he doesn't love me anymore. Subsequently I found out Christmas Eve that he had been cheating on me for 3 months and has a serious emotional relationship with her. We have always had less than perfect communication and in late September while overseas I said some things I really didn't mean and he is blaming that on his newfound realization of unhappiness with me. He doesn't like to mention the fact that he cheated on me in early September, before I said anything. It's been a very rocky few weeks where I told him to move out because he didn't want to work on us, but continues to text and go to her. Recently he says he wants to move back in but in the very next breath says that I am just not what he wants anymore and that he can't be with what he really wants. He then informed me how he wants to be excited again and with someone who excites him...not me, but her. He continues to tell me how he doesn't love me anymore but will move back in to try. Is this even worth it? I am so afraid of being alone for the rest of my life, but he continues to use me which I think is degrading. I'm 33 so meeting people who are family worthy is slim now. Any advise is greatly appreciated.