heh, I had similar situation, but I was 17 years old then... If you feel like that and you are adult... well, Im sorry, but grow up and move one... It sound harsh but this is how life work, be happy that it was not your wife and she didnt take all your stuff.
You get F### once per few years, but you stand up go get some drink, play your favorite game, next day you go to best friend, make a small party or go to bar then just find weird hobby that drain you completely from energy or just go to work and... get ready for it: work your ass off.
I can ensure you that after week or two you will feel better.
If you think that being dumped by GF is sad and you want to kill your self... Meh. Just look around, people have way more troubles that such trivial thing. When you will be one step from being homeless without money for food, or when you really lost close member of your family, THEN you can feel like that. Or health, that is serious thing. for past few months I have serious health problem, and when your doctor tell you that you are F up in a way like he saying what weather is outside THEN you can feel like that. When you start day with alprazolam just to stand up and go outside THEN you can feel like that.
And yeah, Im dragging down your problem down on the list of life problems for your own good. Im not kidding you.
When you realize that people around you have much worst life you actually feel better. This is human nature, we can admit it or not, but when we see someone else troubles deep inside our head we feel better.
Someone can quote some useless book here about love and peace and self-abnegation, but this is crap for people who buy "miracle stuff" from TV commercials. Nah, the faster you realize that its normal thing to feel like that one per some time, the better you gonna get in life. After all life is not Instagram, its not just small peaces of life with colorful filter on it.
Or wait! You know what thing make me happy once time when I was sad? Images of celebs and actors without makeup.... Im not kidding this thing is like RPG stuff +100 to happiness.
As for deleting Facebook and Instagram...
Dude, you should do that long time ago, You dont know that yet, but that was probably best thing you did this year Be happy about that!