My ex still replies to my texts and answers my calls?

So at first, my ex asked to break-up. I tried talking to him and we finally made up. But after that he was very cold toward me, so I figured he took me back because he was sorry.

I must admit that I still love him a lot. Sometimes, I would text him, he would only reply very short answers like Yes, No, OK. But when I call him, he would talk naturally, he would even update me about what he's been up to. But sometimes when I get emo and cry, he'd say "I'm sorry, I have something to do, I'll call you again." But he didn't call back.

I know I should let go, and I know I should move on. But I want to know, does he still care about me? Or does he just do all that because he felt sorry?
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I forgot to mentioned that after he took me back and I felt that it's because he felt sorry, I told him that we should just break up and he said ok.

My ex still replies to my texts and answers my calls?
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