One of the few sane people in this comment section.
I don’t want to want to judge OP too harshly but this is a common problem with women in STEM spaces where they’re treated as romantic interests rather than professional acquaintances. That alone is problematic, but it becomes a lot worse when the man expresses interest, puts his coworker in awkward position, and then treats her differently because she “rejected” him. Most men are not overtly hostile to coworkers who turn them down but it comes out in subtle ways that can disrupt a workplace. I’ve seen it myself, where a male coworker developed a crush on someone in the office that wasn’t reciprocated and the male coworker will not work with her because he’s offended or embarrassed about her not being interested. He hasn’t outright said that he refuses to work with her, but he suddenly becomes withdrawn and quiet when she’s in the same room as him.
It’s fine to be attracted to a coworker, but it’s best to keep those feelings to yourself. As a man in STEM, I have multiple female workers that I find attractive, funny, and interesting, but I recognize that they’re at the office to work, not to be hit on.
Aside from the creepiness factor of pursuing a coworker, it reinforces the idea that STEM is a boy’s club and that women are not welcome. That perception needs to be broken because we need strong engineers regardless of gender. To speak from personal experience again, the company I work at has a culture of making women uncomfortable in subtle ways, which has discouraged innovation and hurt our success.
I recognize Lulu, Corki, Veigar, Tristana, Yuumi (relatively new and I think she’s a cat rather than Yordle), Rumble, and Teemo. I’m not sure who is on the left middle.