Getting doubts

Writing this today i still haven't seen Miss, so the last time we were together was August 28th, almost 4 weeks ago. Weeks without any sign of life from Her part. And that whilst She has been online, several times. not one single line in IM for me ...
I don't want it to happen, but i've been in this situation before. The doubt is slipping into my heart. What is She doing, what is She up to. Why doesn't She IM me when being online; why not emailing me?