My advice to you Chandler is to give himself space, & see what goes from there. My experiences have been similarly but different,
sometimes you can be the one able to say sorry, but the other may not see or view that they've done anything wrong themselves even if they did, if they see that you able to apologize on your behalf of pie then he should see greatly to do it too, after all you mention you have done parts also. It takes 2 for everything, 2 for connection, It took the 2 of you to make the friendship be last 3 years. Just acknowledge to him that we both truthfully made something together for this friendship to hault. Unless, you haven't done any part, you don't owe anything. Just let him know that everything that's been a part the good the downs, involved both of us together, not one or the other alone. What I am doing is still being there when it's the birthday to wish and send a card, this person of mine then knew I was still in reaching, to the point she replied only to say, It's best you don't send wishes on my birthday next year.
She is convincing me to stop even on something that is my choice, she doesn't have to open the card, or email. Just because someone is out, doesn't mean you can't still care for them as a human being, birthdays, new year's. etc.!
Remember whenever someone Block's you, they are convincing you they're no longer there when they are, or when they are blocking you
your to be blocked. The truth is they are the one's blocking, as long as you don't block them, they are blocking the social media site, why be on a social media site to block. Only block should be for those who are inappropriate or of threat. Just remember, he's blocking facebook or etc..not you : )
I am not saying to fix it, he should first foremost apologize for the choice of words he used and mentioned. Your job is not to no more speak or quit from him, if you care, at least recognize that he is human, and you have every right to be hurt, but show him your strong, and you will always support him, you care for him as friend, if he is thru to you, then start with birthdays, or holiday wishes, if he doesn't respond, that's not you both you reconciled to him your moving on in the good, and not grudging what's been done.
Hope this helps.
- writer