My boyfriend sent me a message, but I didn't reply. I talked with him for three or four days, and then he deleted me. Boys don't care about chat records.

Your boyfriend may have lost face and dignity because you didn't reply to her message, and made him feel that you didn't like him or care about him, so he deleted you. It can't be said that he doesn't care about the chat record at all, because it is very likely that he deleted you in a particularly emotional situation, and he didn't consider any consequences at all.

For whatever reason, the boy who deleted you is particularly immature and irrational. It is difficult for him to consider the problem maturely and calmly when he meets the problem. On the other hand, it also shows that he has no ability to bear a family at all. Breaking up like this is actually a good thing for him. He always has to learn to grow up.