I hate this thing about 'if a man is interested he will let you know' implying that if a woman is interested she has to shut her face and bide her time, waiting to see what the chap wants, because that's the power balance. Just wait and see what the man wants because he is all wise by virtue of possessing a penis. Pfffft.
If you like someone tell them. If they like you, they'll presumably be pleased that you like them. If they don't, they don't. Move on. (I recognise this is a bit of a sea-change for me, I have evolved into a state of wisdom)
hissy you should go, unless your twatdar is spiked.
I tend to agree with a little stranger regarding fwb. I think it's great for a regular-casual, but I also think it's possibly a bit timid (apologies, do not mean to offend anyone that it works for) because by merit it shouldn't be complicated, it itch scratches (which is great & good) and marks time until someone turns up that you might be committed to on a permanent basis.. If that's where you want to be. It's a difficult area, isn't it... Because good friends who enjoy having sex with each other... Well.. That's rare and amazing and if you were romantically inclined, actually quite romantic, but you like your space and don't want to be pedestrian.
I like the term 'lovers', but then I'm a bit old fashioned. It doesn't necessarily imply 'love'. :)