Why would a guy "ignore" but not "block" on Messenger?

SashaLouise
In a relationship for 8 months, guy has issues, great at first, went on holiday all good, lot of fun and cared a lot for each other, but guy prone to mood swings,. Last few weeks of relationship, not very nice to woman, stopped texting much etc, putting her down, snide comments etc. She finishes it and doesn't bother him. 10 days later he texts to say he hopes she is okay. She replies with nice text saying she hopes he is okay too, but doesn't bombard him with texts or anything. He then ignores her. She then meets someone else. Guy 1 posts something on FB which all their mutual friends start gossiping about (wrongly assuming it referred to the woman) and she nicely asks him to remove said post. He refuses, gets really nasty in texts, swearing at her, vile to her, then puts her into "ignore" in messenger. Few days later he un ignores her, contact her again and is okay with her, wishes her well, She does same, says forget/forgive his last messages and wishes him well. Says he will always be important to her. Few days later, he again puts her into "ignore" in messenger. Question is - Why would he "ignore" her? It was amicable, and she had no intention of messaging him, and still cares about his welfare. His friends say he is "punishing" her for moving on and by not blocking completely he can see some of her posts on FB. Should she also "ignore" him in messenger or block him altogether. It seems so petty. He "ignored" her in messenger every time he was in a mood during the relationship, and spammed her friend request to her (although she didn't know that at the time)
Why would a guy "ignore" but not "block" on Messenger?
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