<human>: Condense the text into a few key points

So my later school years I had my first kiss with my first girlfriend who also happens to be my first love. We dated for 3 years and never went further than making out reaching up shirts, and a bit of clothed cuddling. Eventually she broke it off saying that she just wasn't feeling the same way anymore and suggested that we both moved on. Devastated, I immediately went searching for a rebound, and found one in my current girlfriend who I've been with for a little over a year. I didn't mean for our relationship to last this long, but things really clicked. I can't deny that I have strong feelings for her, but they haven't surpassed those of my previous girlfriend and I doubt they ever will.

Recently I've encountered 2 problems; the first being that my ex contacted me for the first time since our breakup and is leading me to believe she wants to try again. The second being that my girlfriend is ready to have sex, and I'm really not. Yes I'm probably much older than many of you were when you lost your virginity, however I really can't see myself with anybody but my ex. 

I hate to say it but I really have considered all kinds of slimy things. The list includes cheating, lying to both of them, I've even considered having sex with my girlfriend then breaking up with her and having sex with my ex. I'm honestly unsure of what to do anymore. There's no guarantee that my ex even wants to try again, it could just be my wishful thinking or her being friendly.
<bot>: My ex girlfriend broke up with me, my current girlfriend loves me. My ex may want me back, and my current wants to have sex. What do I do?