I think almost every omni x veg*an relationship I know about has ended in omni x omni. A couple of them are still offically veg*an, but it's not a secret they aren't... Most of them has been omni man and veg*an woman. Sometimes I wonder if people are a bit afraid to be alone, that their ethics is just thrown away for a relationship, if the other person isn't very veg*an friendly?
But luckily, there are always people that change to the better or make it work. I guess it makes really two to get it to work, when you have such diffrences...