Is it bad if I cancel for the third time?

I should meet him today with a boy. We just want to watch netflix and chill out. But I'm so afraid and no desire. Is it bad if I cancel now for the third time?

Japp, it's bad. Tell him WHY you cancel.

That's not bad. But if you really want to build a relationship (my friendliness) with him, then your fear should not stop you from doing something with him

I'm just full of fear and no desire

That's exactly what you should tell him. It is not fair to make someone hope again and again, if you know yourself that nothing comes of it anyway.