The 'Oblivious character falling in love with their best friend and everyone sees it but them' is a well worn trope and clearly what Jeph is going for here. Any doubt should have been put to rest after Faye's talk about how she feels about Bubbles and dating in today's comic. Pretty much everyone around them sees this happening. Some have been keeping it to themselves because they know of Faye's history or out of fear maybe. Some have come right out and said/asked about it. At this point I think that Faye is the only one who hasn't figure it out, which will probably change tomorrow.
And it makes sense that they don't want to vocalize it or think too much on it. Both have been seriously hurt in the past by the loss of people close to them. Both feel a lot of self loathing and believe themselves to be unworthy or are afraid to hope. Both tend to hold most people at arm's length to keep from getting hurt and both are afraid to get too close to someone lest they lose them again. So it make sense to not want to think or talk about it. And again, most of the people around them know better than to push the issue.
And then we meet Evie, who is custom tailored to be the kick in the butt Faye needs to think about this. She has a link to Faye through Amanda, yet has no direct stake in dancing around the subject. She's got psychology knowledge to not only see what's not being said but to push Faye into realizing it. Amanda or one of her friends just telling Faye she's got the hots for Bubbles wouldn't do anything. Faye would just brush it off, and I think Evie realizes that. Which is why she's using leading questions to get Faye to actually think and talk about her feelings towards Bubbles.
I don't get why people are hating on Evie for doing this though. Unless they think Faye should just continue to wallow in denial? At some point that trope has to have a pay off and the storyline has to resolve, or it's just bad writing. Evie isn't psychoanalyzing or pushing Faye into doing anything. Just asking some leading questions to get Faye to think. If a mechanic hear's a friend's car and starts asking questions or pointing out that the timing seems off, should they be yelled at for butting in? Why specifically does Evie's psychology training preclude her from talking about the very subject she's studying except in a professional environment?
Although if Faye does end up going "robosexual", she will be the second main female character (after Dora) to find no satisfaction in hetero relationships and end up turning to alternative sexuality for fulfillment. I find this...interesting.
I think you are reading way to much into that. Dora was established almost from the beginning as being bisexual. Her issues with Marten had nothing to do with him being male or even really to do with Marten at all. They had to do with her trust issues. Something that breaking up with Marten made her finally realize she needed to address. The fact that she's been in a stable relationship with Tai for so long is more an indication that Dora has realized that learned to trust more and that Tai was willing to put in the emotional labor that Marten wasn't. None of this have anything to do with their respective genders or sexualities.
Most of the relationships shown in the comic have been heterosexual, with at least as many stable, working hetero relationships as homosexual ones, possibly more. Faye and Angus has a long term successful relationship until Angus got his dream job and got on the bus. It wasn't his gender that was an issue, but distance and Faye's fear of abandonment.
We have seen people with close and deep friendships that don't lead to romance. Brun and Renee for one. Notice how they don't blush and swoon while complementing each other or talk about each other the way Faye and Bubbles do. I don't know where Jeph will take the story, but I can plainly see he's been dropping hints all along. Had one of them been male I don't think people would be questioning so hard that there was some attraction at work there.
Also, the phrase 'alternate sexuality' is loaded with bad subtext. By describing homosexual attraction as 'alternate' it establishes that heterosexual attractions as being 'normal' or at least baseline. That to have homosexual attractions is different from what is expected/normal/baseline.