Free Bird

I recently had a boyfriend. It sounds weird to me. Boyieeeeee freeeeend. 

I am a grown-ass woman saying I had a boyfriend.  I felt like I was either 15 years old or married most of the time.  

He wants to know what he did to push me away.  He misses me.  

What can I really say? You’re a swell guy, but I need to be independent.  I cannot really explain it. I am a free bird.