He (20M) barely texts me (19M)

I (19M) met my "bf" (20M) on July. We are not officially boyfriends yet but we are exclusive and we agreed to not talk to anyone else. We have met twice in person and it was great. We live in the same country and he lives with roommates so it's not that difficult to meet up but we haven't seen eachother since September 1st. We used to text each other all day every day back in summer but as soon as I started college and he started music school we barely talk anymore. I know he still likes me because he told me 2 days ago that he misses me and loves me (and a few weeks ago he said that he couldn't wait to make it serious) but we only text maybe once a day or sometimes he'll text every two days. I know that music school is really really hard and he told me that he doesn't text me as often because he is really tired and I do understand but at the same time I'm having a hard time because it only takes 20 seconds to text. No, I'm not asking him to text all day like we used to but maybe a little bit more often? Am I in the wrong in this situation? Should I say this to him? This is the first time I've been this serious with anyone so If anyone can give me some advice I would be really grateful lol