I cant feel anything for this girl after sex

Yes i know i am a asshole.

Me (M18) been talking to this girl (F18) for a while and things went great, too great actually. by the first week of talking we already talked about a future together and how our couple routine was gonna be, things were going great until we had out first sextalk.

After my orgasm i was shocked to feel like i had no feelings for her whatsover, even thinking about her without feeling extremely unattached was Impossible, there was no attraction to her anymore, until i got horny again, i thought that was a normal thing with masturbation so i just endured through it.

Skip a few weeks and we finally had our first sleepover, things were going great again, as i said she is exactly how i thought the love of my life would be.

After we had sex, there was it again, a empty feeling, like nothing is there. Again i was shocked and dont know how to feel like it, im so lost and i feel like shit for making this girl think i have feelings for her, even though it was just my hormones talking.

Should i seek therapy? Should i keep enduring through It? Or should i just end it all?

It hurts because she is all i envisioned but i can only feel things for her whenever i am horny