Open adoption with family member?

I am 11 weeks pregnant by my fiance. We are not going to get married any time soon. We had a rocky relationship before, and now that I am unexpectedly pregnant, it has gotten harder. He wanted adoption right from the start, but agreed to be supportive and a good father should I choose to keep our baby. (He also recently moved six hours away for a better job opportunity and probably would not be able to find work again near me in his field. I do not want to move away from my current residence because I grew up here and have family/friend support here.) The past few weeks I had been leaning more and more toward keeping my baby. I have a reasonable job with salary, and I'm in my 30s. But I am on COBRA insurance which is expensive, and I was not even sure previously that I would ever want children at all. Today, I got an email via my mother from a cousin in another state. She is married with two children and she and her husband are interested in adopting my baby, if I don't want to keep him/her. My cousin is a very sweet and kind mother, educated and loving. I don't see her much or talk to her nowadays, but I have a lot of respect for that branch of my family and know they would be good parents. Her husband is a pilot and a good, strong person. They even said they would buy a plane ticket for me to come spend time with them if I wanted to get to know them and their children better. She also said it could be an open adoption, but I am not sure if that is better or worse. How would I feel some day, seeing MY baby, and not having it in my life? The idea of adoption is somewhat a relief, especially with someone I know and could trust. But will I horribly regret it some day? Just looking for some opinions. I don't know much about any of this -- motherhood, pregnancy, adoption, or anything. Thank you.