<human>: Long story short:

My ex girlfriend, call her Sarah, and I broke up because I didn't feel she was putting effort fourth.  During the few weeks we split, I met somebody new, call her Kate.  Kate seems like everything I want out of a girl.  Seems so perfect.  And I figured I may give her a chance.

Then Sarah texted me.  She wants me back.  I think it could be better if I went back.  She's already showing me more effort just in the way she's texting me and what she's saying.  It kind of makes me want to go back.

But I'm afraid I could pass up something better for me with Kate.  I don't know what to do.  I don't want to lead either of them on.

Can you give me the gist of the text in a nutshell?
<bot>: Do I trust that my ex of 2 months will change things for the better or do I give the new girl a chance?