I agree somewhat with Trickyboy
This behaviour from him is appalling and needs to be addressed. I don’t think I’d go there but rather would telephone, with a script ready. Ready to leave a voicemail but also ready just in the off chance he answers.
I’d tell him that ghosting behaviour is cowardly and cruel, that you’re very disappointed in thus behaviour as you thought more highly of them than thus. .
Tell him you thought you both had invested in this relationship which is why you continued to contact him snd was worried about him. However while it is acceptable for either of you to end the relationship if it’s not working, that it is common decency to actually tell them it’s over. Such a shame he doesn’t even have that.
Enc by saying that he need not bother to respond as your purpose was to do the right thing and end things so please do not text, call or contact t me again.
Then block him.
You don’t need this treatment
If there was something that happened to him, someone has access to his phone and read your messages but didn’t reply to let you know something happened. Do I don’t buy that
With his messages being accessed nothing has happened to the phone itself. Plus I’m sure with email and telephone plus web access he could've contacted you by now if it were a phone problem all those excuses have expired with the duration this has gone on.