Is it better to block or ignore an ex?
This all depends on how you feel and how your ex is behaving.
If you don’t mind seeing your ex on social media then just ignore them.
However, if they start becoming abusive it is better to block them..
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.
Is blocking immature?
Depends. If you are blocking someone over a minor disagreement and you don’t want to talk to them for two years then yes that is immature. If you block someone to be vindictive and spiteful then you are immature. However if the person in question harasses or treats you badly then it is ok to block.
Is blocking him a good idea?
He might have made the decision without you and cut things off without explanation and it felt like nothing you said or did would make a difference. Blocking him is a reminder that you’re still in control and you’re going to to do what’s best for you.
Does no contact work if you are blocked?
Yes, the no contact rule can definitely work if you’ve been blocked.