I'm a "law school widow!" What should I do?

I have been dating this guy for about four months. Everything was going really well (he even told me he loves me), but now things have hit a freeze. He is just beginning law school, which is difficult, but he hasn't been as affectionate or loving ever since he started school. Every time I mention this to him, he simply replies that he isn't going to apologize for getting a legal education. I am supportive of his attending school, and he knows this. But, it seems like he has become completely self-absorbed and neglectful ever since he started school. He even has this attitude when we are together. I am considering ending the relationship, but I love him, too. I just want to be treated a little more nicely. Right now, I'm trying to back off, but what should I do?