@Goingthedistance You haven't done anything wrong. You picked a bad one. It happens. If your goal is a warm LTR, its going to need to be the right girls not just a girl with an available pussy. At least you found out she was wrong for you early not after you had started banging her.

Falling for someone is natural. If you lose that ability, you have damaged yourself with too much casual sex/ casual dating. Its a lot harder for a man to do this than for a woman but its still totally doable. Don't do it.

Its worth noting that to an extent women kiss to find out if they really want a man. Its biological and they don't usually understand that themselves but it allows them to check your genetic compatibility as a mate. You get a lot of french kissing at the start of a relationship but very little if any once you have been banging for years. Why -because she already knows all it has to tell her, she needs no further reassurance and you have already thorougly shared your biomes.

From a male reproductive point of view, compatibility is less important -if you can knock her up, well that's one more baby mother for you- but in her case its a 20 year investment to raising a child and that child needs to be the best one she can get. So don't be surprised if you kiss a woman and that's as far as it goes. Maybe, if you were Mr smooth, you could bang her a couple of times and get some so so sex before she got up the courage to say "No thanks" but this would help you not one bit in your quest for a warm LTR.

Be selective about who you chat up. Do you like the smell of her? Do you like the "aura" about her? If you look at this sort of rather subliminal thing, you are already screening for compatibility. I happen to have banged every woman I have ever kissed (and there are some you bang that you would never kiss). But I have actually been very selective about who I approached, only warming to women after I already felt a pull from them, rather than leading with my eyes.

My biggest mistake ever was kissing a woman the first time, knowing from that kiss that I was not into her and never could be, then banging her because I felt I should as she was very sweet and very committed to the idea of us. Led to years of misery and infidelity on my side before we finally got back to where we should have been after that kiss -saying goodbye.

Compatibility matters for a LTR. If its not there, then do not blame yourself, look elsewhere.