First, a little about me.. I'm a guy in my late 20s and recently got diagnosed with (severe) asperger's syndrome. I haven't really learned to handle it properly yet and for those that don't know, in this context, it pretty much means that I'm terrible at expressing my emotions, interpreting the emotions of others and picking up on signals. I'm not sure how relevant that is, but I tend not to 'make a move' unless a girl has made it explicitly clear that she is interested in me, otherwise I simply do not know... and I'm sure you all know that girls spelling out their feelings plainly towards a guy they like is not entirely common.
The reason I'm posting here is that I've been talking to a female friend regularly for quite a while and I've developed stronger feelings for her. It isn't love at this stage, but I could see it turning into that quite easily. I don't want to ruin my relationship with her as a friend and I'd gladly remain in the friend zone and let the feelings that I have now subside, if the alternative is to scare her off and lose her as a friend.
I've known her since I was a child but we'd had very little contact for a long time and, since around a year ago, we have been speaking most days. Sometimes she seems really into me, though other times I feel like I'm far from a priority for her. What makes it more difficult to interpret is that we live on opposite sides of the country (although I will be moving nearer to her for unrelated reasons in the next few months), so we only really talk on the phone or through text. If it's a phone call then generally she is the one who calls me (she has a much busier life than I do so I tend to let her take the initiative when she's got time) and if our texts die down then she will send me a silly message or a funny video or something without motive or purpose to get my attention again, usually within a day.. although this could just be her innocently relying on a friend to alleviate her boredom. On rare occasions we video chat and it feels like there's a lot of chemistry.. lots of giggling and not-so-awkward silences as we just smile and look at each other... but being so physically removed it could just be my imagination.
I know it's never black and white (despite what my neurological condition would lead me to believe), so if there's no clear cut 'yes she is into you' or 'you're already well in the friend zone', or some other obvious thing which hasn't occurred to me, then I guess I'd just like some advice on communicating my feelings without damaging our friendship.
I guess anyone giving a solid opinion on how she feels might need more detail on how we interact, but I'm going to stop this essay here and if anyone wants more specifics then I'll add them in a reply.