I fell in love with my pregnant friend

I am 29 (female) and she is 22. She has 2 children from 2 different fathers and I am married to a man, but fell in love with her.

She knows I love her but I don’t think she feels the same about me even though I tell her over and over again. My husband just thinks she’s my regular friend and I don’t know how to tell him that I’d rather be with her instead of him.

What do I do??