Reject A Love Confession

What if a certain someone starts to feel about u more than a frnd? There is this girl I helped her moving on from her toxic ex cuz she really treated her badly. And i was really nice to her thinking that she is emotionally weak but she got attached way too much and confessed i already have my partner...so i kinda feel awkward around her i don't want to end this frndship (and its mutual )cuz she really got only me . but sometimes i really don't understand how to act around her
I feel bad for her because she fall for wrong person and then her second love was also at wrong person. But i can't help her i tried to say that what she is feeling isn't love but she is persistent .. am i doing right?