Great, if you have sufficient evidence of marriage entered in good faith, your I-751 will be approved. Essentially, you're at the crossroads - either you'll have an approval and get 10 year GC or you will be denied. Denial can be overcome, but not so easily if USCIS accuses you of entering marriage for immigration benefit. The worst case, is obviously, if you lose I-751 and get referred to immigration court. If you lose that - you may be stripped of LPR status and ordered removed.
One thing I'd recommend, if your soon to be ex is cooperative, is to get a detailed written statement from him, describing how your relationship formed, developed and ended. He'd mention dates, facts, reasons. And at the end say that the marriage was bonafide, didn't work out but he doesn't mind you getting conditions removed.
If you work with a lawyer for I-751, you can ask them to write a draft for him to sign and have lawyer reach out to ex instead of you to minimize any emotional response and conflict.
Good luck!