We recently began exploring group sex. But he insists I crossed a line one morning, and is punishing me with silence and distance

My husband and I are in an open relationship (both male, married for eight years) and on a recent holiday we started to explore group sex. We had a wonderful threesome where we both felt great afterwards and had a mutual attraction to the other man – which is rare for us. However, our latest endeavour wasn’t as successful.

We invited a couple and a single man back to our hotel room. Everything was great during the fivesome, and afterwards the couple left. We invited the other man to stay the night (mostly led by me). In the morning, things between me and this man started to heat up. He went to the bathroom and I asked my husband if he wanted to partake, to which he said no and that he’d rather sleep. Regardless, I carried on with the man for a short period until we climaxed.

After he left, my husband was extremely mad at me. It wasn’t a boundary we had discussed, and I’ve apologised. However, part of me feels like it isn’t as bad as he’s making me feel. He has punished me with silence, distance and an expectation of pandering from me throughout. I also feel like he’s using it as an excuse for his own bad behaviour of concealing communication with other men. Our agreement is to be upfront and honest about everything we get up to, but he has a history of hiding and erasing sext messages, and in general is quite closed off with his feelings. Am I morally in the wrong here? And is there hope for us in the relationship?