in the first scene she's taking a pill to forget the first person(without the tattoos) then she sees the second in the mirror (guy with the tattoos)
next scene she meets the second person while wearing the grieving dress (which is for the first lost love)
while grieving she remembers what happened with her first love. shes with him writing stories,poems. after the love and affection scene it cuts to close ups in their face. there's a look on her face like shes getting betrayed (hint in lyrics) or the relation is over.
so she went to getting treated for memories of her first love & the heartbreak (tests says loving him is ruining her life). second love rescued her from seeing the readings of her treatment (here she didn't finish her treatment)
next scene is second guy calls her to give life another chance n promises love.
next scene shows she was going insane for her first love in the grieving dress burnt the poems, stories of them they wrote together
then we watch her seeing the second guy in herself while in the mirror (losing herself again) so she breaks the glass which means shes back where she started
cuts to how she gave the second person a chance which landed her again the same place taking the forget him pill