I have no suggestions that have not already been mentioned @wishthiswasreallife I do feel your pain though. When me and DH met in our mid 20s, and moved in together about a year later, he didn't snore, but about 10 years later his snoring became horrific. About 12-13 years ago, we moved into a house that had a spare bedroom for us, and I have had my own room from that day. (For the 10 years or so in between I had a hell of a job trying to sleep, and spent much time on the sofa.)
I'm not sure I could have stayed with him if that had not happened. I could not have carried on sleeping with him indefinitely, and no way was I spending my life sleeping on the sofa. (HE wouldn't as he claimed he was 'too tall.')
I don't understand how couples can sleep together indefinitely, and I think it's untenable for a couple to sleep together in a 4' X 6' bed forever. Not only the snoring issue, but the farting, the coughing, the grunting, them flinging their limbs around, the pulling the duvet off you, and them just being there.
It's all lovely and snuggly when you're a young couple in the first flush of romance, but after a few years, sleeping with someone just becomes a chore.
Even with a King, or super king bed or whatever it is people suggest, you can still hear the snoring, and smell their farts, and hear the muttering and mumbling and coughing!
If me and DH split I could never/WOULD never sleep with anyone else again, ever. I can't imagine even being arsed with anyone tbh, and would very likely stay single.
As pps have suggested, earplugs, or a sofa bed for the lounge - for HIM.