As everyone else has said, it just comes down to where you draw the line. If you are comfortable with it, at least to a certain point, then definitely be with the person you like.
It may even be enlightening for them to date a vego!

Personally though, I can date a meat eater who shows compassion and open mindedness, but in some ways I feel like the relationship is somewhat doomed because of the conflicting morals. I don't think I could ever commit seriously to someone who has seen something like earthlings or who has sufficient knowledge of what factory farming entails and still chooses to eat meat. For me, that conflicts with my morals far too much. I don't really see eating meat as a difference of lifestyles....a difference of lifestyles for me would be like smoking or non smoking, or maybe raw vegan and vegan, you know? Like, I didn't become vegan for the lifestyle, I became vegan because of my morals.
It's such a dilemma though! Cos all of my family and most of my friends eat meat, but I obviously still want relationships with them, so what is the difference with a partner? I could go on all day.....haha but I won't.
Anyway, bottom line; just do whatever feels right for you