Should I continue this friendship?

Hey, I am 22 male.
When I was 14 I got into a relationship with my then best friend, we broke up due to some misunderstandings caused by teachers and friends.
Last May 2019 after around 7 years she contacted me again which basically reignited our friendship. We both have been there for each other since we started talking again.
I was her shoulder to cry for everything from the silliest matters to when her mom passed away and vice versa.
Last month I have realized that I still have feelings for her. And I was forced to confess this to her when her father started bringing marriage proposals to her
She said that she didn’t feel anything romantic towards me.
I don’t what to do, I can’t be in contact with her when she gets into a relationship with someone else that would crush me like how it did when I was 14
But breaking contact over the fact that she doesn’t like me feels selfish especially since her mom passed away this March.
I feel obligated to be there for her even if it breaks me. Things would have been much simpler if she felt something for me or if I didn’t feel anything for her.
- looking forward for advices ( I don’t want to hurt her)