A lot of people have bad "digital hygiene" and don't seem to realize they're fucking up their own lives because of it. There will likely be little to show for it in the future.
This sums it up for me:

He probably had a social media addiction and it is actually a huge dis for him to consider that comparatively empty and shallow activity superior to relating to you. So I'm glad he's "ex".

I say "probably" because another reason some guys escape into other things is that they are super approach avoidant around intimacy. You also may have just been a bad personality match for each other -- perhaps he needed someone less intense. Any way you look at it though making him an ex was clearly the way to go.

Idiot

That sounds like a HIM problem, not a social media problem. He may have had an addictive personality. That is like saying is alcohol or weed destroying relationships? No. It is people that lack impulse control and cannot manage things in moderation that are the problem. I feel the same way about video games. Are video games destroying relationships? My ex was obsessed with them. Like put stupid online fighting games over sex obsessed. But I still won't claim they ruin relationships but I damn well learned my lesson and will never date a gamer again. yughh

Short answer is "yes" - there are many articles written by divorce attorneys that state unequivocally that FB and other social media has made cheating, flirting, hooking up and diverting attentions much easier.

It has also made finding evidence of same much easier too.

Generally speaking (and admitting that I may be a bit old fashioned here), while I acknowledge that for millennials social media is an essential part of being in touch and sharing with one another, I personally find it rude when someone can't put down their device while I am in their company.

My phone is on silent and put away while spending time with hominids.

Ummmm, why is the "EX" spending the night? He is EX for a reason, remember?

He is obviously not the right one for you. He should marry his phone.

His message is you are not important. I would dump him.

From that description, you should thank social media because it saved you time and pain. Use everything like that as a filter or an opportunity to tell that person how you feel If they choose to listen, move forward. If they choose to ignore you, dump them.

Everyone has therir morning routines, but i thought spending the night at someone else's house meant accepting the routine would get changed for a day. Anyhow, being shitty in the morning is like being shitty when youre drunk... its just because youre a shit

Yes, media is destroying our society to some degree.

In short answer to your first question, Yes. It is destroying many things that have been associated with humanity and sociableness for the last 3.4 million years. ...And all this destruction over about 15 years. Humans are a wondrous lot.

Speaking only for myself, I don't need Facebook or any other particular cellphone item in the morning (unless I need to check email for work or something like that, but that's obligation rather than a psychological need). But I'm also not at all a morning person, so I need to do something that doesn't involve other people for an hour or six, until I can perk up and feel moderately social. So, I might take to my phone for an extended period just for something quiet and solitary to occupy my mind. It might seem in the morning that I'm antisocial and/or surly — probably true — but mostly I'm just so introverted that I need that time to mentally charge up for the grueling task of social interaction. Eventually, I come around. (I realize I'm being a little facetious, but I'm not really joking; there's a serious reserve of emotional energy I need to build up to successfully engage with people in the morning.) Maybe your ex is a bit like that too, needing to wind up for the day and social engagement.

That guy sounds fifty shades of cray-cray. Being the last generation to not have it, I'll always prefer face to face interaction and use social media really only to keep in contact with my dear friends and family that DOESN'T live in town. Hell, my phone....is.....brace yourself.....just a phone.

I'd say you dodged a bullet with that one.
I don't want to be with any guy who'd rather be on his phone than with me.