SHE.
She's dogged.
Why??

Because she posses the ability to never give up.
She never gives up in loving someone.
She never stops loving even after numerous heartbreaks.
She never learns from what she goes through.
Because she has learnt this unbounded and longing love which she shares every person she encounters with.
She's easily flattered.
She's easily convinced.
You might be thinking She's easily available, so be it , She's.
You take care of...