so you have a childhood bestfriend and you were inlove with them but you can't confess cause they only see you as a friend but they're partner for 3 years just confessed to you that they like you for and that they only use your bestfriend to get with you
Realistically, reject the bsf's partner, tell bsf abt what happened and urge bsf to find better partner (you), but dont confess until bsf gets over w ex-partner
Or kill em. Idk, your choice reply