It can just take a little longer for them to express their emotions and feelings, so be patient and try and hold off on physical contact until he drives it.
Incidentally during this time I have reflected a lot on actions which I feel I could improve as a person reconnected to my hobbies and as a partner giving more freedom to Aquarius boyfriend.
I have a situation where my Aquarius boyfriend of 2 years wanted to think through things and seems like he wants to break things off; this happened after I asked if the jewelry he wanted to buy was an engagement ring.
Don't get me wrong; I'm not saying you need to learn rocket science to get him interested; all you might need is to engage him in deep conversations to keep him on the same page.