<human>: Can you succinctly summarize the text in 1-3 sentences?

Background- started dating end of junior year. She was coming out of an emotionally abusive relationship (crazy ex who couldn't let go) and we both sort of fell into it. Despite this being my first relationship, we got through her self-esteem issues, the emotional damage, etc. Fell hard into love. 

Fast forward to end of summer right before college, best summer of my life (alot of firsts) The relationship was supposed to end, we were going to colleges 4hr apart. We agreed on it and went through with it for a day. She said she made a mistake and wanted to try a long distance relationship.

Result of long distance relationship- we got closer, got through fights, saw each other once a month, I ended up transferring after she proposed. (time passed = 1 semester) I didn't see ldr working out and didn't want it to end.

Present- at the same college, still care about each other, still in love. Then I do something stupid. Not realizing that feelings change/grow, I break up with her because I'm unsure whether I'm still in love. 
This lasts about a day, she asks for me back. I agree. 

The problem- because of insecurity and our past "breakups", she often questions whether I love her, whether I wish I hadn't come back, would I be happy with someone else? I don't have the experience with anyone else to answer this and I tell her that.
I don't think it's enough, she always withdraws after these conversations. That hurts.

My lament- should I end this for good? Or stay despite the pain, because I do love her.
<bot>: Girlfriend asks whether I would be happier with someone else despite this being my only relationship. It's making me feel uncertain.