<human>: Provide a brief overview of the text.

Hey all, so thanks in advance for listening to this. So my SO and I have been seeing each other for a few months, going very well. However, the last week or so, I've been having some intrusive, unsettling type thoughts. My ex [21F] and I broke things off 6-7 months ago, after she cheated on me while I was away on a business trip. I've started seeing my SO consistently a few months after that, whereas she has been through a few guys in the time since, none of which have really worked out. 

While my relationship with my ex wasn't the greatest (we fought here and there, had fundamental disagreements about religion, politics, where we wanted to go in life, etc.) the sexual chemistry was probably the best I've had. So, as you might guess, before I started seeing my SO, I did hook up with my ex a few times. 

With my current SO, we are completely on the same page as far as beliefs in personality. She's exceptionally intelligent, and challenges me in ways I've never even considered by someone I'm dating, and I can truly call her my best friend. The sex is good, but not as good as it was with my ex, which is where the issue seems to lie. (Current SO was a virgin before me, and my ex had been with a few guys before me, so that might help to explain things).

I guess currently I'm just wrestling with these thoughts of physical and emotional attraction/chemistry, and it's been pretty rough on me these past few weeks. That being said, any words of advice or any opinions would be greatly appreciated.
<bot>: Great personal match with my current SO, however the sex isn't as good as it was with my ex, having wrestling and conflicting thoughts about the entire thing as a result.