I let my bf have sex with sister

I started going to university far away. I didn't want us to break up. My bf (28) has a very high sex drive and I can't help him with it while I'm gone. We have phone sex a lot but it doesn't help. One night I was telling my sister to visit my bf cause I needed her to give him something. I told her she would need to do things for him, and that everything was okay, she just needed to listen. I told my bf that if he needs to he can ask my sister to help with his urges.

She went over and I didn't hear from either of them for a few hours. My sister first text me that she finished helping. Then my bf called me and told me all the details. I could hear him enjoying himself telling me everything he did. It was really hot that he enjoyed it and I hope I was a good gf..