<human>: This past Valentine's Day I came across a video of my boyfriend having sex with his best friend on his computer. I always had a gut feeling that his friend was gay and had a huge crush on my bf but I never thought that my bf would act on it. Everyone had those suspicions and would ask me but I always said they were just friends. I told my bf that I had my suspicions and to watch out for him but I never told them to stop hanging out. 

I confronted him after I found the video and he said that it happened once, eight months ago and that he didn't like it, and he didn't want to say anything at the risk of destroying our relationship. He says he is absolutely disgusted with himself and he didnt like it. He thinks he is bisexual but he isn't sure because those feelings freak him out. I am genuinely disgusted and cannot get the image out my head. 

He says he is still in love with me and that it was the biggest mistake of his life. He said he is definitely not gay but thinks he is bi. He wants me to give him a second chance but I am just so distraught and confused I dont know what to do. Please, I could use any piece of advice right now!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I recently found out that my longtime boyfriend slept with his male best friend but he wants to work things out with me.