You’re only 22 and yet you have all the responsibilities of an adult. It’s no wonder to me that a part of you longs for the simplicity of being 15 and the time of being relatively carefree. I assure you, your feelings are only partly about missing this old boyfriend. They’re mostly about missing out on time to be young. While other people are in college, living with friends and partying, you have a little girl and a home to take care of. Your ex is a symbol of what could have been if you hadn’t made the choices you made.
From what you’ve told me, you are in danger of jeopardizing a very good thing in your present by longing for the past. Stop all contact with the ex. Conversations with him and keeping him as a Facebook friend just feed a fantasy. Your choice wasn’t a bad one. You just took a different path than people who decide to stay single until 30. You have a wonderful man and a sweet little girl to love. They don’t. Focus on the love and luck you have. If you can’t do it on your own, get into some therapy to help your feelings match your grownup life. Your partner deserves to have all of you. Your little girl deserves the stability of a loving home with the dad she’s always known. You deserve to settle into your good life.
I wish you well.