Long-distance love, what is the mentality of a boyfriend who always doesn't return information?

There are two possibilities. One is that your boyfriend is really busy and doesn't care about the information. Another possibility is that your boyfriend has a new partner, and he doesn't want to live with you anymore, so he wants to alienate you in this way. And this possibility is still relatively large. So if possible, you'd better find him directly and ask him face to face.