prudence,

You did not say how old you are.  You are sad and confused about this relationship and your past relationships.

Have you tried to being on your own for a while, i.e. without a romantic partner/boyfriend?  I suggest you do that for it will give you the experience, the confidence, the emotional strength to know you can stand on your own two feet without having to depend on someone else to validate you, to prop you up.

You have a young child so between taking care of him/her and making a living, I would think that is pretty consuming.  Do you have a circle of friends?  Things that you are interested in, e.g. crafts?  exercise/sports?  volunteer work?  art?  hiking?  school?

Learn more about yourself by looking at all your relationships and find out what are some of the common denominators that are in each one of them.  What are the characteristics of the men you attract?

Good luck,

Mark