I've been ghosted by a close female friend and I couldn't believe the pain and humiliation I felt.
Even a bad break up where you hate each others' guts, but get it all out and know where you both stand is faaaar better and much more preferable than being gaslighted into thinking things are fine one day, then literally waking up to being cut off with zero explanation!!
A person who does this to you has no real respect or appreciation for you. It's the lowest of the low. How on earth can you be intimate with someone over time then suddenly treat them as if they are dead without explanation?!
The only exceptions are if someone is truly experiencing severe depression, is going through grief, is extremely ill with a life threatening illness or is trapped abroad.
Bar the above, this man does not deserve your time or effort ever again. It's mental cruelty and a form of abuse...accept it and forgive and he's liable to do it again. It's a character flaw. That said if you decide to wait for him to 'return' at least you might get needed closure. I have to say I don't think bar the scenarios above there can be an acceptable explanation.
Be careful if he returns to any hit of gaslighting/reverse faultfinding of you.
I am sorry this has been done to you. No one deserves to be treated like this. Block, delete, grieve (for as long as necessary) and move on is my advice