Should I block him or just ignore him?
Blocking, going full no contact only assures that they will have to put more effort into getting through to you.
Ignoring leaves easier avenues for them to get to you.
You can modify your ignoring protocol make it a bit harder for them.
Block them from all your social media, and change your passwords..
Do I respond during no contact?
You must still not respond. If you feel bad about this, if you are ignoring him and it’s his birthday, or he’s broken down and wants your help, or whatever, just remember that he dumped you (or treated you so badly you had to leave him).
Will he come back even if he blocked me?
The answer is NO! Don’t block him back even if he has done it to you. The no contact rule doesn’t call for you to block him/her back. This applies whether you broke up last night, last year or whether it is a long distance relationship.
Will no contact work if he blocked me?
When an ex has blocked you, you must go into full-fledged use of the no contact rule which means that you don’t communicate with them in any way at all. No texts, messaging, or calling from another phone number or app.