How do i make my friend feel better over a 'fake' relationship?

Well, if she's hurt, comfort her, and tell her how he wasn't worth her time anyway, and he's a dirtbag or something. Fake relationships are dumb, and anyone who want's to date someone just to date and not even really care about the person, must be pretty desperate.
~{Dunsforhands}

Right now my father figure is going through the same thing. If this was me personally I would comfort them and be with them as much as you can. I would also tell them that they're not alone and other people are going through the same thing. If they're a fangirl I would comfort them with their otp and lots of fanfiction. I would also recommend Youtubers like Markiplier, Jacksepticeye, Kub scouts, Natewantstobattle, and Nateanddookie. Hope this helped at all. :3