<human>: I recently started dating my ex again and it was going well until he asked about my sexual relationship with a different friend from the one I've mentioned in the title. I panicked, got defensive, lied, and eventually came clean. 

He was furious and asked if there was anyone else in my circle of friends I had fooled around with. I confessed to sleeping with a different friend five years ago and he became even more upset because he believes said friend is a terrible person and abusive towards his ex-girlfriends. My boyfriend is convinced my friend only keeps me around to harm and hit on. He won't listen to me when I say there's never been anything even remotely sexual between us outside of that one night. 

My boyfriend said his condition for taking me back after lying was to stop hanging out with any friends I had previously fooled around with on my own (or without his knowledge) and to stop talking to the friend he hates. In my desperation I agreed, but told him I would need to see proof of how horrible my friend because my friend has never done anything wrong to me and it didn't feel justified. 

It's been almost five days and I have since found out that his reason for thinking my friend is horrible is based on one Facebook conversation with a random stranger and gossip from my friend's twat of an ex-girlfriend (known liar, among other things). 

I've already told my friend I need to distance myself from him at the moment, mainly because my boyfriend was dissatisfied with my inaction and swore to handle it personally (read: potentially violently) and I didn't want my friend to be caught unawares. 

I'm hoping that I can make my boyfriend see he's wrong about my friend, but I'm wondering if these are red flags that tell me something is always going to be wrong in the relationship. I love him, but he won't listen to me and it kills me to cut out a good friend over someone else's opinion and selfishness. 

Should I keep my commitment and stop talking to my friend? Will I ever regain my boyfriend's trust? Where do I go from here?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Boyfriend caught me lying about my sexual history, rashly committed myself to stop talking to a good friend in an effort to make up for it.