Hi just reading your story 🙁 it is very hard when a relationship ends as im sure we have all been there. Even worse I would imagine when your ex is hitting on a freind and anyway if she was a friend she would not be flirting with him at all. So let them both go and stuff themselves hehe……
But the lonely thing you talk off is the worst bit, loneliness can eat you up and send you on a downward spiral. Have you a good family structure? Or best friend you can talk to about things?
Sending hugs your ways xx