So at the start of December a partner of little over a year H and my flatmate/close friend P told me they had started to develop attraction to reach other and basically wanted my blessing in exploring it.

Beyond the timing being a bit bad (I had been dumped by one partner the day before they told me) I felt mostly ok about it but with a few concerns which I also told them about.

The main concern was that while I love my friend P, they are very chaotic in their romantic/sexual relationships. And I am afraid that if H and P has something it would turn chaotic and possibly put me in the position that the person I'm living with either is jealous of me, can't stand my partner or both. Or that I'd have to find another flatmate to mitigate that problem.

But it felt ok after voicing those concerns and P acknowledging that my concerns were valid.

Now last week, P is going to be living in another county for work for half a year and so last week P and H hubby out in our apartment to talk about how they wanted go about exploring while P was away.

Everything seemed ok up until the point that another friend M had come over and we all lay down to cuddle/watch an episode of the Witcher.

In the middle of the show P, who had been laying sponing M, got up and walked out the room, we asked if we should paus but they said we didn't need to.

It seemed a bit off but it was during a quite intense couple of scenes do I figured it may have been due to the sensory issues that P sometimes has.

When the show ended P went into the room again looking agitated and asked me "Are we ok?" I was taken by complete surprise and just said "Umm, yes? Of course?" And without elaborating P rushed out the room.

Then they stood and brushed their teeth still looking upset and slightly angry.

I asked them if they needed a hug or too be left alone or something else(which is something we do when the other is upset usually) they say they don't know and then goes outside for a while.

When they get back they are still upset but talks about feeling like I had replaced them when watching the series. (During the weeks prior me and P have been watching series together some evenings.)

I comforted P as best I could, I had been mentally exhausted the whole day and was already low on spoons so taking on the emotional responsibility for descalating this situation put me very squarely in the red.

The day after P didn't bring this up or acknowledge it, which felt bad as that made it once again fall on me to bring it up. And I didn't because my spoons were already almost gone when I woke.

After a few days I had time to feel a bit more about it and the whole situation gave me very cold feet with regards to P and H dating. Given how strong P reacted to this I'm more and more convinced that they aren't mature enough or in a place in their life where they can handle them dating without it leading to a lot of drama.

I've talked with H about it and she totally sees where I'm coming from. Have yet to talk to P about it at length although I've told them off the cold feet (they have already travelled to the place where they will be the next 6 months, otherwise we'd have talked already).

I don't know what to do here. I want to be supportive of them exploring but this situation played into my fears without there even being something especially intense happening to trigger it.