Ok, thank you for trying the game.
So, you have a few problems with some choices, I can assure you they are all possible, they have been tested and tested again, and they work, but you are not the first having some difficulty finding a way to unlock them (when I find the time, I'll work on a walkthrough).
Sorry that some choices are not to your liking, but the game is written that way, at the start of the game, Myriam is a very submissive woman and married to an asshole, the heart of the game will turn around her discovering another life beyond that. So it will take some time before she can be more independent and/or dominant. About the "shitbag" more in spoiler.
The next update is a first step on that road, since it will be the occasion to kick the asshole to the curb.
For the motel choice: You just need to avoid the shower event, so she has no guilt over what happen with Dudum and is able to push her husband back without any remorse.
For the spa: It is not really a spa, it is hinted later in the discussion between Evelyn and Myriam, it is sort of a sex club for rich people, offering a diverse choice of services.
For the writing skills, yep, sorry, doing what I can, I have some people sending me corrections, I have also someone that contacted me to help me on it. So if you see something, please do not hesitate to point it out to me, it will help me do a better job in the future.