My (24f) fiancé (24m) decided he wants to be celibate for the rest of his life 2 weeks before our wedding

Should I postpone my wedding, seek common ground, or be celibate with him?

My fiancé and I decided that we were finally ready to get married after almost 7 years dating, 6 years living together. Recently, we have been very sexually active. Like, almost daily within the past month. It has been a really great chance to explore each other, try new things, and it has been really exciting for the both of us. Our sex is always very intimate and never just a "quickie". We spend time pleasing each other and it has never felt like a "chore".

He has been on a spiritual journey of some kind and started talking to me about sperm retention and the benefits for about a month. At first, I wasn't necessarily comfortable with the idea of having sex with him where he would just stop before orgasm. We tried it once, and I didn't feel as guilty as I thought I would. I'd be cool with riding this out for as long as he felt it was necessary.

Today, he told me he never wanted to have sex again because it would make him stronger spiritually, and more enlightened. I was shocked, and I have honestly been crying all day. He wasn't just saying until our wedding. He really, at this moment, never sees himself being sexually intimate with me or anyone else ever again. I took this really hot. This conversation then turned into one where he explained "well, we can have sex, but neither one of us can orgasm". I don't want to be sexually involved with anyone else, I don't want to leave him, I don't want to suggest opening the relationship, but I do want to feel wanted in an intimate way like sex.

I have absolutely no idea what to do, and it feels incredibly unfair that he wants to make such a huge, life-altering decision 2 and a half weeks before we get married.

TLDR: Fiance wants to be celibate for spiritual reasons and practice sperm retention. He decided this 2 weeks before our wedding. He said that 1. he never wants to have sex again, or 2. We can have sex, but neither one of us are allowed to orgasm. I am upset that he is suggesting we can never share that experience again, and I have no idea how to find common ground.