<human>: Throwaway!

So I've been dating this girl for about six months. There are lots of things I like about her and some that I don't. We started out as fuck buddies that met on POF and started spending enough time together that one thing led to another. Bam! Relationship status official. 

I've been married and divorced before, and it kind of messed me up for awhile. This is my first real relationship in two years. I've found that I'm guarded, slow to feel and slightly apathetic. I also think she likes me more than I like her. We are not in love. But its nice to not be alone and we have fun together, so I'm coasting. 

Last night I get a text from a random number. A little back and forth texting ensues and I find out its an ex (years ago) that I'm still attracted to. We also lost our virginity to one another. I spent quite a bit of time with her in the months after my divorce, but it seemed just friendly. I would have liked to explore a rekindling of romance, but I just wasn't ready. She ended up being pursued by someone and drifted away into a serious relationship. Two years pass, and here she is again wanting to suddenly "catch up." She's single and I'm not. But I would be a liar if I said I wasn't interested in trying to find out if there's a spark even though I'm with someone! She may or may not be thinking what I'm thinking. We haven't met up yet. 

What do I do?

Can you give me the gist of the text in a nutshell?
<bot>: In an OK relationship. The one that got away twice shows up in my life, and I'm feeling weird and torn about how to handle it.