Rebooting while in a relationship

so I have been watching porn semi routinely from 2012-2017and slowly delved deeper and deeper into what porn had to offer... I never got so far to gain PIED, however i don’t feel too much when having sex. I’ve been dating this girl for a year and cut out porn completely. at first I had delayed ejaculation for sure. But as things went on, it got better. I orgasm quicker than I did before and I feel a little more but I still fantasize about the stuff I was into when watching porn.
I feel very little when orgasming and it’s very underwhelming when having sex with her.
Will I have to cut sex out of my life for a full reboot to revert my orientation back? Or can we still have sex with no orgasm and it would do the same as hardcore reboot?

My girlfriend knows of this problem and although she says she is okay with stopping sex for 3 months, I’m worried she might be so unsatisfied and look for sex with somebody else.
What should I do?