What if my boyfriend doesn't answer the phone or reply to the text message, and WeChat sends a little picture?

The reason is complicated. Both sides are at fault, right? Because of personality. Your boyfriend thinks you leave too little personal space, or he has any personal reasons, family reasons and so on.

You don't have to get too excited. This kind of thing can only be explained in person. It's no use getting angry now. It is better to have a good sleep and solve the contradiction face to face.