Is it my fault?

I lost my Virgin at 14-15. After I broke up with him (end of freshman year) I got with K( we'll call him K)
I knew from the start that he was never the type to settle down any time soon. Drinking party. Fun. Staying out late. Sex. Good times
I was dating him for about 9 months. I loved having no worries more than school. (Not that he did his)
We were never worried about getting pregnant. He had a reputation for not using BC. I assumed that we were safe. We had a crazy night we're he half came in me. (In previous relationships he came in the without any BC and didn't pullout)
Anyway at 16, I found out I was pregnant. Our relationship didn't last a month after. It wasn't the same. I was pregnant. I couldn't drink and be that fun person I was before. He called me a dead weight and felt chained down. Honestly I did too. I felt like my whole life was a bore. I didn't know how to have a good time anymore.
We broke up, and I lost trust in him. I didn't want him around our baby, even though he was doing what I knew he would. I knew he wasn't ready for a baby, and I would've been doing the same if not for the baby. Still, he promised to be with the baby. 
I lost myself through pregnancy. I was such a bore. I never did anything fun. I didn't know who I was anymore. I found "me" again once I had the baby.
My son was born in December last year. He's almost a year and K helps as much as he can were he can. He is holding a steady job (the same as when we were together) 
•Was it my fault that I got pregnant? 
• was I foolish to stay with K for so long?

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