Thank you all for your answers. All of them were really helpful, and I'm glad I got so many.
Special thanks to you, RainyGrlJenny. It was really interesting to read someone's opinion who has experienced something like that themselves.
I am going to talk to my BF today and try to assure him that there really is no need to feel awkward for his poly actions, while I stay at home and do my mono-things. To me, this is a crucial thing. I can't take feeling pressured into polyamory anymore. For example, there have been times when we have felt especially close or happy, and he has suddenly started asking things like "So... you seem to be really happy at the moment, like you really really trust me... Maybe you feel differently now about polyamory?" And questions like these have left me feeling just "

".
We had an argument again today on basically the same topic. A few months ago we had a very
very important discussion, at least for me. I had felt a bit that maybe a polyamorous future would mean that everything I had ever dreamed of depended on others now. Like, let's say, I had dreamed of 2 children, but when this relationship turns into a polyamorous one for him, then maybe I have no power over it, like none at all, no point in even discussing this? Maybe everything I get will depend on others? But what about my individual needs? Am I even allowed to ask for something specific?
So we targeted this problem and we ended up talking really nicely about it, and what I really felt I needed in the future was my own home with my BF. He may visit others as often as he wants, and of course, they may come over as well, but I want to feel that our home is our home. Whoever visits is basically a guest. They have to let me know first, not in an unfriendly strict way, but just a text or a call before, like you would act with anyone. I feel like it is a normal thing to ask for, because I wish to live a monogamous life, and my BF could live with me if, let's say, others have more partners, but he is my only.
I am a person who really needs her private space. I want to know when people are coming over. I don't want anyone to rearrange anything. My BF fully agreed with that, because this does not entail separating myself from everyone else, by any means. It just means that I need a place called home, just for me and him. He may feel at home at other places, as well, of course, if he wishes that. This has been my only specific wish actually, and had he said no, we would have discussed it more. I would not want him to live with me like this if he was unhappy about it.
Him understanding and being fine with it made feel tremendously better, like a weight was off my shoulders. I must say this was one of the things that changed my thoughts on polyamory. I didn't have to force myself anymore to accept my BF's wish to be polyamorous. It just happened. I guess I felt safe and heard.
I have reminded him of that several times, in the style of, "Remember that conversation? It changed so much for me. I often think about it and it makes me feel so calm and nice." Plus, of course, he must have noticed that effect on me. I even told him that before on forums I often only read about bad poly experiences, but now that has changed and I read those that are about working relationships.
However, today he let me know that he does not remember that conversation, and wanted me to tell him what I truly want in the future, from the bottom of my heart. I have no problem repeating those things, but we already talked about them, and that meant a lot to me... and now he says he doesn't remember? Tell me again? That made me feel that he hopes that I have a different answer this time... maybe a more polyamorous one.
He even told me he doesn't believe that those are my real wishes, basically that I am following monogamous society and
mistakenly believe these are my wishes. But they bloody
are mine! (Sorry.) I just want to feel accepted for who I am, and I can't take telling him about my true wishes again while feeling that in his mind he is rolling his eyes.
