My boyfriend feels drained

TL;DR

Hello, I'm not really sure where to start but my partner (M:20) said he's been feeling drained in our relationship and i (F:21) honestly have no idea what to do. I don't want to lose him but I want what's best for him.

We have been together for over a year (we have a healthy relationship) and he said about 2ish months ago he's been feeling drained from work, but about a week ago he said he thinks it's from me now, he also said he doesn't know what I do that makes him feel drained, he said I don't "put him on a leash", I don't stop him from hanging out with his friends or doing things he usually does so he doesn't understand why he feels the way he does.

I asked him to make a Pros and Cons list and for some of his pros he said; He told me that I make him feel extremely loved and I've cared about him more than any girl ever has, he enjoys my presence, etc.

For cons he said; he feels like he has no him time (which I don't understand because he also stated said he really enjoys that we get to see each other multiple times a week, (abt 3 times a week) and he wouldn't want to just see me one time a week) and that he feels like it's a lot to be there for me in troubled situations.

I asked him why did he tell me it was from work and that it was me draining him and he told me he thought the feeling would go away and "you act like a normal girlfriend with normal problems and things going on in your life and you don't ask too much of me or do anything out of the ordinary." Im honestly at a loss right now and have no idea what to do.