Dear GhanaWeb: I slept with my best friend's boyfriend

Dear GhanaWeb, I'm trapped and in need of help. I'm a 21-year-old young lady. I have a best friend who is practically my sister. There is a recent development that has been giving me sleepless nights. It so happened that on my birthday. I went to the party with my best friend's boyfriend because she was unwell. Since she could not make it, I went with him to the party because she felt bad. I don't have the foggiest idea of what happened because everybody was high and living up a great deal. I ended up having sex with my best friend's boyfriend because he was getting very emotional about leaving his friends after college and I started consoling him. One thing led to another and we ended up in bed. It has been two weeks and this is killing me. Also, she confides in me such a lot that it's killing me. Assuming I tell her, I will lose her until the end. If it's not too much trouble, let me know how it would be advisable for me to respond. How would I tell her without losing her? Dear GhanaWeb is a relationship, and lifestyle advice column by GhanaWeb where the GhanaWeb audience responds to your questions and problems about relationships at home, work, and beyond. Share yours with GhanaWeb via:features@ghanaweb.com. ADA/BOG