My gf cheated on me so i fucked her best friend [MF]

Long story short. I havent seen my gf for about a month because i was away. Her best friend lives near me. They planned to be at hers that day and i didnt tell my gf that i came back. I spoke to her friend and we said that i will drive her to my gfs house so i can surprise my gf. We arrive and my gf asks all happy and that. She then invites me to her room and i thought that we are going to fuck. Turns out she just had to tell me that she cheated on me. I immidiately went out of the room and told her friend that im going home and if she wants a ride home she has to go with me now. She didnt know what was happening but she could tell i was furious. We will call her Harmony and she has dark hair, huge ass, green eyes, she is really short and she has a pierced nose.

How i [M] fucked my best friend [F]

Im sorry for mistakes im not english.

So she has dark brown hair and brown eyes, she has darker skin color, big ass and c+ cups.

We know each other since we were young and yes i had a crush on her and she didnt know that. She is my best female friend ever and we know pretty much everything about each other. From time to time i would jerk off to her and that was probably the only thing she didnt know. She has a boyfriend since we were 18 (now 20).