Is he being friendly or he is interested?

I have been talking to my crush recently. Earlier, either of us would initiate the conversation first. Lately he is not initiating, so I started texting first and when I do so, he shows so much interest and takes the conversation forward ( like asking personal questions and so on). We have a very good talk at a nice comfort level. Then he is ghosting me for a week or so.

What does this even mean? Is he being friendly or is he interested or is he playing some mind games?