It just keeps getting harder.

Last night she sent me another text. "Was going to see if you wanted to grab a drink." Of course I said I couldn't, but she is adamant. "You have to let me buy you a beer sometime. I owe you a few." Well, yeah, that's true. I blew a little over a grand taking you out, buying you drinks, buying supplies...I wouldn't complain about her buying me a drink or two.

I just want to know her motivation. Am I looking at this wrong? Why does she keep trying to get me to let her in all of a sudden? Why can't I stop thinking about her? I've moved on and found a healthy relationship, but she has found a way to weasel her way into my thoughts. I don't know what to do here.