Unrequited

As difficult as it will be, I think I need to distance or cut ties with my bf bc she’s straight and I’ve fallen in love with her. At times I think I can endure the difficulties and suppress what I’m feeling just to maintain our friendship and be around her. But then when I’m around her, self restraint and composure is so challenging! We’ve know each other for 12+ years and have been there when the other experienced losses of children or spouses. Losing her friendship would be as traumatic. I genuinely love her deeply and I know she loves me, just not romantically. Is there any way to salvage this?