Yeah, I definitely look for cues and communication styles. That's just common sense. But, I still "overstep" sometimes or "read them wrong" one way or the other.
I'll give you an example: This is not a "brag" at all - let me be the first one to say that I am
not Mr. Smooth with the ladies. Not by a long shot. But, I have this recurring situation in my life that I attribute to my "sx" variant. I will meet a woman who is somehow intrigued and even attracted to my openness. A couple of them may have been sx, and a couple of them not sx. We will hit it off really well (as friends!!!) and talk about interesting stuff and, blah, blah, blah. Weeks will go by, we've gotten to know each other better, even hung out with mutual friends and done some fun things together, shared a lot of laughs, etc. Then when I find out that they are "in love" with me, I'm like:

I just didn't see it coming. And I never saw them
that way at all. And when I have to tell them that I don't see them that way, they become very upset. Like, "what the? What do you mean? Look at all the stuff we talked about and all the times we hung out!" "Umm, yeah, so?"
I'm thinking it's because, as someone mentioned earlier, "I'm zooming in on that person." I'm really interested in getting to know them and what they are all about and maybe they've never experienced someone having that kind of a genuine interest and focus on them. It has certainly gone the other way too - where I end up falling and they think I'm a bit too "intense".
It's actually happening right now with a friend of mine. With this particular girl, I've never even gone anywhere with her. I've only talked to her when I go eat at her restaurant. Good talks. Interesting talks. Many of them. But, now she's asking all the time if I want to go hang out, do this, do that. As a result, I had to scale it way back. I didn't think the girl would fall for me. She's much older than me to begin with - I'm closer to her daughter's age than I am to hers. How did I know that our talks would result in this? She was interested in what I was saying and I was genuinely interested in her. Just two people talking. And when I tell her I can't hang out, she says stuff like, "I think you're smarter than you let on. You know more than you act like you do." Inside my head I'm thinking, "Yeah, what I know is that it's become obvious that you like me and I've made it clear to you over and over in our conversations that I'm happy being single and am not interested in any form of dating or relationships right now. So, why do you continue to press me when you KNOW where I stand?"
It sucks that I have to lose a great friend over that. We could have continued talking like a bunch of crazy teenagers and become really good friends. So, they seem to think that I had it planned the whole time: get close to them, suck them in, and then spit them out and break their heart. That's NEVER how I enter a situation. That would be pathetic. In reality it's just realizing that "oh this person is cool and interesting." And each conversation becomes progressively more interesting. But, they are the ones asking the questions about me. It was their curiosity that allowed me to open up. It wasn't me "hunting them down" and trying to break their heart. But, the result of it is that I'm a bad guy. I suppose I've got to be smarter than this and just really not go there with people that I know I wouldn't date. But, then I feel like I'm not being my self.
Oh, and I don't know if this has any meaning or if it's just coincidence, but those women almost always seem to be Fi-dom or Fi-aux. The commonality seems to be that they never share with me that they are developing feelings in the early going. They just wait until their frustration boils over and then they blow up on me. Fe-users would probably tell you at the beginning, "I can see myself falling for you." I'm just saying, the fact that they never communicate that they are developing feelings until after it has become "full blown love", plays a role in me being so surprised by it.