Whats up with my cancer man

Sorry new to this site, but I need help. I have been with a cancer man for a little over a month we are both older, both divorced once so to old to play games. Anyway in the beginning he was so nice and sweet always texting goodmorning and thru out the day and evening. When we were together it was wonderful. We had lots of fun and enjoyed being together.

Now the past week and a half I can barely get him to text me back. We saw each other over the weekend. I thought everything was good, we had talked about it and I asked him not to shut me out that I understand he's busy at work and that, but he could still respond when he's able. But now after we saw each other it's back to where we were with little communication. I'll admit I get the occasional one sentence text and thats it, which is more than I got the previous week. I asked if we could go to dinner, he had to work. No problem I asked if Saturday would work and he said "as of right now Saturday should work". I have texted him since and I get nothing. So basically since I saw him a few days ago, and yes we had a great time together, I've gotten one sentence responses.

When I did see him he told me he loved me and that we are still together as a couple and he doesn't want me to date other people and he doesn't want to see other people. I have no reason not to trust him.

I am seriously hurt I dont know why he went from texting me constantly and wanting to see me all the time to not texting me, seeing me once and now only one sentence responses with a maybe about Saturday going out.

I have heard cancers can retreat, but I really like him and want to make our relationship work, but I feel like I'm the only one trying. What do you think is he pushing me away? Does he want to stay together? Any advice would be appreciated.