<human>: I feel like a train wreck right now and I really don't know how I'm going to deal with this. 

My husband and I have had a very happy married life, I've never had any problems and sometimes, it still feels like the honeymoon phase. But today morning at around 9, his friend came over like usual. He's always coming over, frequently having dinner with us and hanging out. I never cared cause he's (was) a nice guy. They've been friends ever since middle school. 

I went out to get groceries and when I came home after about an hour, I walk in on my husband ON TOP of his friend making out and groping each other.

 I lost it at that point and I screamed. They froze and my husband was telling me to calm down and I dropped everything while insulting him in every way I could and drove 45 minutes to my sister's house. He's called me a gazillion times and I know he'll eventually figure out Im here. What do I do? I never thought he was gay or bi, never had the slightest suspicion. They never seemed close like that. All I can think about is how many times they've been alone together and it's eating me alive. Please help.

Can you provide a brief overview of the text?
<bot>: I walked in on my husband making out with his *male* best friend. I'm staying at my sister's house now and I don't know what to do next.