Honesty is always easiest but as you say "Since then we have become very serious" so I would focus on the "since then" period and not give it another thought....meaning shed the guilt - no reason to dig up old "bones" ... especially since you are both happy......
OMG, is it me?? Have either one of you forgotten that he LIVES w/ his W/SO!! How in the hell can he be upset over something as mundane as a platonic R, when he LIVES w/ his W/SO??
As long as he continues to live with someone and keep you in affair status, what you do, who you see, who you sleep with is none of his business, and I hope you see this. He has some nerve being the jealous one considering he has sex with someone else on a regular basis. I say keep seeing whomever the hell you want to and to hell with him and what he thinks. What's good for the goose is good for the gander.
Just because she has "hormonal" problems that prevent her from enjoying sex doesn't mean that he's still not having it with her. Doesn't matter any way...once a week...once a month, fact is he does have sex with her and, therefore, what you do behind your own closed door is none of his business.
OMG, is it me?? Have either one of you forgotten that he LIVES w/ his W/SO!! How in the hell can he be upset over something as mundane as a platonic R, when he LIVES w/ his W/SO??
Unbelievable! That takes nervy to a new level!
When he first brought it up I was angry because as you say, he lives with his SO.
I totally get what you are saying.