Can I have feelings towards a married woman? I don't think I would be ever happy without her.
How well do you know her?
Not much, I only met her once.
You don't even know her. You should just leave her be, she's already married and it doesn't make sense to spend time trying to pursue her.
I just know that she's the reason I can't love other women.
It seems your hyper fixated on this woman. You really need to focus your mind on other people before this comes more overbearing for you. Therapy may be helpful for you also.