I've been with my partner for 5 months and he's generally lovely, caring, generous etc.
I also have a friend (a guy) who I've been close to for 4 years and we work together. He's a very good friend to me and is always there for me. After I split with my ex and just before me and current partner got together, me and friend were out with some other friends and we got drunk and ended up sleeping together. It only happened once and it didn't change anything between us. We just acknowledged it was a drunken thing and resumed as normal.
I don't have any desire to be in a relationship with him and he knows this. I just value him as a person a lot.
My current partner is a worry wart and insecure. I was upfront about my friend from the start, and one night when partner kept going on and on asking me if there was anything I think he should know, I told him that me and friend had slept together one time, but that it was simply a drunken thing and neither of us are interested in being in a relationship with each other, hence why I'm with him and not friend.
Fast forward and my current partner is becoming more and more jealous and insecure about me still occasionally talking to friend. Friend and I work together so we have to see each other, but aside from that I never text him, and if he texts me (usually something innocuous like a funny meme or to ask something work related) I reply in a way as to not engage in much conversation, but also not be so blunt he thinks I'm being rude!
My partner has asked that I stop as much communication as possible with him and that he feels far too uncomfortable about the whole thing.
I've reassured him that I only want and love him, I have no feelings for my friend, it was a one time thing etc, and while I understand why he would feel uncomfortable, at the end of the day we've been friends for a very long time and before I knew partner, and I don't just want to cut him from my life completely. I've said to partner he can check my phone when he wants.
I just want to know if IABU to continue my friendship as I also don't want to upset partner.