This has been prerna's constant character. That doesn't make her weak IMHO. Right or wrong, anurag Is the most important to her. She knows it, accepts it, and is ready to put up with anything for it because he makes her happy. The rest is just background noise.
This and her conversation in one of the later episodes with mohini where she says "iss duniya me maine sabse jyaada pyaar aapke bete se kiya hai", are according to me the foundations of Prerna Sharma and dictate every relationship and decision in her life.
Prerna always made it clear to everyone that it's Anurag for her. Right or wrong , whatever decisions it's her own and it will be for Anurag.
It's not like she is rubbing herself on a man who don't love her, if she loves him most he proved time and time why he deserves her love.