Which way do I go?

I have been comtemplating if I should continue on with filing for a speration from my husband or not.

Back Story: I was dating my husband since I was 15. He did not finish HS, but he was the love of my life. I was told numerous times that I could do better, but you can't really choose who you love. We had our little disagreements and fights, but continued our relationship even when I moved for my senior year. I moved back two days after I recieved my diploma to be with my love and a year later I was pregnant. We lost him- he was a still birth. We couped with the loss differently and started to get a little distant. Even through all the hardships we tried again. We had a healthy little girl almost a Year later. We were still financially unstable, but we had a little family. Eventually, due the lack of responsibilty on his part- I became the sole contributor financially. Eventually I broke up with him and Dated another man. I fell for this other man and was confused so I tried to eliminate myself from the love triangle. We then stopped talking and my "husband" eventually got me to take him back. I married my husband and the financial issues continued. I joined the service because I needed to provide for our daughter. The "lost love" (3 years later) contacted me and we had an afair :( My husband and I haven't been the same since. Now I have a major dilema! I am in love with the "lost love", and am almost positive he is in love with me.
"Lost Love"- Has a career, has a child with another woman-whom he is no longer with, and lives thosands of miles away

WHICH WAY DO I GO? Should I just stay single and just take care of me and my little one? or should I continue to "try to make it work?"

Your opinions will help no matter which way you believe is right. Thank you in advance for reading about my delima and I an appreciative any/all opinions.