Aries woman and Aquarius Man?

I am an aries woman, and I have know this man for many years. We use to work together about 15 years ago, and at the time we had a sort of fwb relationship. We lost touch many years ago, but about a year ago he contacted me for basically what would have amounted to a call. I seriously considered the idea, as I as extremely ually attracted to him. However, I wasn't sure how I felt about this and I decided against the idea. Just about 4 weeks ago, he contacted me again. He made it very clear that he wanted to "hook up" again. Now, I have agreed to meet him. However, I have a question. Over the last 4 weeks, we have been txt'ing and talking a lot. Some days, he is extremely talkative and we chat all day. Other days, I CANNOT hardly get word out of him. It's all very confusing...lol. I am excited about the possiblity of what may happen when we meet, but I'm also a little confused about how he feels. He sought me out twice and has been very direct, but he can also be so detached and make me wonder if he's really into me. Help!!!