No help yet can u please help me! i love her?

Okay I've asked this question twice and all I can get for an aswer is f*ck her ect. Please help. Well me and my best friend have benn friends for 5 years now. She has had a hard life her mom died of brest cancer when we we were in 9th grade and her dad was murdered our junior year. Well since then she has had a son and got married. Well come to find out her husband has cheated on her numours times before and while there were married and he is addicted to . She has fallen out of the love with him and they are seperated and he doesn't want anything to do with the son or even help with him. Well me and her have fallen in love with eachother and I have come to love her son as my own! We have had once and kissed and made out aswell. I'm not wanting to rush her into anything or push her into a relationship just kinda sittin back and letting it takes its course. Well we were talking about us being in a comited relationship and she said she knows I will treaet her right and she does love me aswell but shes afraid if we done work out by chance, she doesn't want to risk losing the one person who has been there for her through everything. All her friends and family and my friends and family tells us damn near daily we are ment to be. But she's afraid. What do you think I should do?? Walking away from her or letting her go isn't an option I've tried dating other girls and all I can think of is her and that's not fair to them. Please help me here. PS sorry so long thank you for reading!