Yes, and here you place the blame squarely on the men who are doing what they agreed to, and not on the women who violated their own agreement and then expected something to change, usually without ever actually communicating their expectations. That is quite the sexist attitude.
It's not a matter of who's right and who's wrong, but a matter of unrealistic expectations, usually combine with un-communicated needs and stereotyping. If you want something ask for it. If you don't ask, don't cry when you don't get it. If you ask and don't get it, terminate the relationship. It goes BOTH WAYS.
It's actually happened to me both ways. Had a woman that I was FWB with, she got attached and started stalking me. When I broke it off entirely, she got upset.
Another time I was FWB with a woman, and she started getting attached and she broke it off abruptly. Funny thing was, she was one I got along with on a day-to-day basis quite well despite her being 10 years younger than me, and I would've quite seriously considered a change in our relationship - but she didn't ask. She made an assumption and broke it off.
In BOTH cases, it was lack of communication that screwed things up. If the first one had expressed her feelings and I'd clearly said "No, I don't want that" that should have been the end of that. The second one left without even finding out that things could've been different.
So I don't see how you're correct in assuming that it's "men's fault."