<human>: I genuinely find SO attractive and she is both smart and funny. We have been seeing each other for a while, and everything is cherry and the sex is outstanding, but she never seems to have any convictions of her own. She wants to please me and act as though her own needs are secondary. She wants me to do the things I want to do and she wants me to be happy. All great, but it seems a little unhealthy and it feels like she trying to conceal a lack of chemistry.

I think all of this has driven me to think more about my ex, which I rarely did beforehand. She was confident and fiery and we sometimes fought, but she was my peer. We split due to distance (athletic opportunities at different colleges) and getting back together is not a real prospect for either of us right now. 

My relationship with my SO is pleasant, but should I cut it off before it gets too serious if I have so many doubts about her?

Can you condense the text into a few key points?
<bot>: My SO treats me really well but has a lack of confidence that makes me think about my ex. Should I call it quits?