beta
See my issue here is for open relationships communication is a BIG thing, this includes the fun, and the uncomfortable talks (literally every little thing is talked about). You have to be willing to have an open dialogue with your partner(s) about various things and all partners need to retain an equal amount of vulnerability. What makes me uncomfortable about this relationship is a couple of things but I think the main thing is the difference of vulnerability between the two partners and the lack of communication on certain topics. The MC met the ML at his most vulnerable and instantly shared almost all of his secrets with the ML, however, we've seen that the ML is very private and shares minimal information, to the point that the MC has learned most of his information about the ML from other people (secrets aren't a bad thing, but a difference in vulnerability affects the power dynamics in a relationship). I think it's this stark difference that made the MC so insecure. Also, the ML communicates very selectively leaving no room to discuss topics he doesn't want to talk about.
Now this doesn't mean the MC is not also at fault. He should have gone to cool off and collect himself before making any accusations. Also, the language he used was chosen very poorly (I get he was emotional), but he needed to open an unbiased dialogue not use love or accusations to pull the convo his way. He also agreed to something he wasn't initially comfortable with because of pressure (which can't hate too hard everyone does, but you can't place the blame on someone else because of the outcomes)
I don't blame him for coming to terms that he didn't want to be in that type of relationship though, many people think they are okay with something until they actually experience it (consent can be withdrawn at any time and that applies here as well). He may have 'known going into it' but that doesn't mean he didn't still feel pain.
Honestly, neither of them should be in this type of relationship because neither possesses the proper tools to maintain it in a healthy manner. They are both in the wrong and both have things they need to work on.