If there is any human involved, things can get difficult. Many times, stubbornness blinds people; obstinacy can also do its thing in someone who is led by instincts or learned behaviors throughout life.
It also happens that it's impossible to know exactly how a person will act in a given circumstance, although many of us are quite predictable most of the time.

In relationships between friends with benefits, there is a high probability that some of the parties will fall in love (or become obsessed), or that many of these relationships start when one of the involved parties is already in love. Bad idea; it's like falling into your own trap!
The one who falls in love may start to feel jealousy, possessiveness, desires for the relationship to progress to another level, and everything can become very intense and complicated. I know a case of a guy who claims to have fallen in love with a friend with benefits and then believed he owned her. He became obsessive, and although she always clarified the situation, he pretended to understand but really didn't accept that he wasn't reciprocated, and he began to stalk and threaten her so she wouldn't be with anyone else. It was difficult for this girl to escape that situation; the guy already looked like a shadow. He only calmed down when he found a new target, and I hear he's probably in the same situation now. Poor girl, she probably had no idea what she was getting into.
I don't agree with having friends with benefits; others can do whatever they want, of course, but I prefer to avoid that kind of relationship. Personally, if I like someone, I like them to be my partner—there are no middle terms for me in that sense. Whether the relationship works or not is another matter; it could only work for a while, and that's fine too. We are not eternal nor owners of anyone.
For now, I’m leaving. This weekend, I have a beautiful view; I woke up early, which is something I find difficult most of the time. I will be spending a while contemplating this.

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