Is it normal that it seems like he changed?

I was about to agree that you have to take some initiative in the relationship, but seeing as you definitely have changes things. Maybe he is depressed or stressed, as a guy I completely understand the need for space but lately I've only been seeing my girlfriend about once a week and that isn't enough for me. Perhaps he isn't happy in the relationship, not that I'm blaming you as it could be all in his head.

All I can recommend is show him you believe in him. Sometimes all a person needs is to know that somebody believes they are better than the rest and worth while. You also want to avoid giving himself a negative 3rd person view of himself. If you always tell him you never get to see each other, it becomes normal; instead say things like "I can't wait to see you" or "when I see you im giving you the biggest kiss (or whatever you want)", be endearing and not critical. Criticism has it's place but only when you truly feel it needs to be done, which is what you are rightfully doing right now. When things get better between you two don't criticize him for this phase, just be happy that you're together again.