As a vegan you would be better off dating other vegans or maybe at least vegetarians. It would make more sense due to compatibility

You can’t change people and yes it’s a huge sacrifice for them to make to meet your needs. I am surprised you don’t understand it’s a sacrifice on his part. I have somewhat hard time understanding when people find others to date and then want them to change. You can’t change people.

Personally I don’t each much meat but I am not a vegan, if someone expected me to be vegan because they are, it wouldn’t work out. I have no desire to be vegan

This relationship won’t work out in a long run because you two just aren’t compatible. Find more compatible partners who don’t need to be changed into someone they aren’t