depends on how long you've been dating, how old you are, what he was going in for, and the level of commitment. if you're about to get engaged or seriously discussing marriage (not just "oh i love you so much let's get married one day" but really discussing it as in "let's take the next step and really make this happen"), then waiting a few months would be a-ok, maybe even waiting a year or more.

but it also depends on the severity of what he's going in for...if it's just a minor thing, maybe it's ok, but something a little more serious? do you want to be with someone like that? if you stay with someone, especially if it's a year+, then you could seriously be committing yourself to something and then find out during that time period that it's not what you want. and then you'd have to tell him...is that really fair to him??? not really, in my opinion.

i agree with birdgirl, you are young, bfa, so seriously think about this. don't commit yourself to something that you're going to regret after he's been in for a few months