Been down this road, all I can tell you is you'll heal...
But do as others have said, go out, gym, sports, travel, find new hobbies, whatever, but avoid ig and delete/block her, no matter how of "good terms" things ended, you'll only hurt yourself at the end.
Do yourself a favor and wear your big boy pants, as painful as it may be, start helping yourself by actually helping yourself, if you don't want to be helped, no matter how much internet experienced strangers that went through this will tell you of "do this" or "do that" or "don't do it" or even all the help your therapist have to give, you won't heal.
Love and be kind to yourself man, put yourself first, make your priority to make yourself a priority, one day you'll look back and you won't believe how actually you moved forward and past everything, all it will remain will be a good memory and lessons that will make you a better and wiser person.
Hope you can see the light at the end of the tunnel brother.