<human>: So I'm currently in the strange period after the end of a long term live in relationship which went sour. 

Been licking my wounds and started talking to an old flame again online after no contact for years. It's made me realise how important chemistry actually is when choosing a partner. 

My recent ex was in many ways a perfect fit for me; physically attractive, very feminine, into the same stuff as me etc. And yet I never felt the kind of animal attraction I feel with this old girlfriend.

The girl I'm talking to now is unstable, depressive, drinks too much, more of a tomboy. Red flags everywhere. And yet I find her insanely sexy in a way I never felt even once with my recent ex. Looking back sex was 10x as good with this old ex even if we had little in common and were terrible for each other in many ways.

Anyway, looks like we're going to hook up tomorrow night and it got me thinking about chemistry. From now on I won't ignore this kind of base animal intuition when it comes to relationships and just wanted to see what you guys thought.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I find my old ex way more attractive than my recent ex for inexplicable reasons I am now equating to primal sexual chemistry