Welcome to the Forum. A belated welcome. I regret you have had to wait so long for a reply and would like to reassure you it is nothing to do with you -or the subject of your post. Unfortunately sometimes the system does not work as we would like.
Being ghosted is a horrible thing to happen. For you it means you never have any answers, that you like most of us will wonder what went wrong and if it was anything you said or did or looked. You are left in limbo with these corrosive thoughts about yourself eating away at you.
This of course is made worse by the reminders you get on social media when you see the person engaging in a life without you. This makes the traditional answer which is not to have any reminders virtually impossible
It is hard but one really has to step back and try to see it is not a reflection on you at all. It is all about the ghoster, who has been selfish and cruel , with no regard for anyone but self. A person who is a sad case realy, not being able to form good relationships but has to run away.
Dating apps are not always that good, the match up peoples 'wants' and 'likes' and put people together. There is so much more to being with a person, but how do you measure kindness, consideration, fun, steadfastness? You can't. So you can end up with someone who superficially knows all the moves, but for whom the whole thing means nothing.
If they appear attractive, and many do, that simply makes it worse and it is so hard to break away ,stop hoping things will improve and try to live normal social life again.
I've no magic formula to stop your grief, however it is best trying to get out and have contact with others , if you have close understanding freinds or family, lean on them. If you have interests or pastimes at which you are good , or enjoy, then do them. This can lead to accomplishment, or simply a feeling you are worth rewarding. It's surprising how well this can work over time.
You are welcome here anytime (and will no doubt be answered more quickly next time too:)