Oh, you said you feel like damaged goods, and that no one will love you as much as you love him. It is normal to feel like this. However, think about it logically. You won't be alone for the rest of your life. At some point in time, you may start dating again. The man who chooses to be with you knowing you already have a child is going to have to love you so much more than you could've ever loved this sperm donor that had made false promises to you. This guy (I don't want to even give him the privilege of calling him a 'husband') is going to have a much more difficult road ahead of him because he is soooooo messed up. A healthy individual would not do something like this. He is damaged, and he will have a tougher time finding someone to be with. He will never be able to commit to a long term relationship. Anyone who spooks this easily, or lies to himself and others, or whatever the heck his problem is, is not going to find someone else and have a great relationship.
This whole experience is going to teach you tons about yourself and life. You are in accelerated relationship and parenting 'classes.' That means you are an evolved spirit, and you can handle this. Use the lessons you will learn in the months and years ahead of you. You have so much time, you are only 20. I am 30, and some people say I'm lucky to be unmarried with no kids, but I consider those with a family very very lucky. Oh, and I'm dating one of those guys who are damaged, and I'm seriously trying to get out. They won't change until they open their eyes, and accept that they need to change/grow.