Kjell, sometimes you have to stop and think what exactly it was you did. Figure out why she sees you the way she does. Sometimes, it's what you do and what you say. Other times, it's just giving someone attention they don't want. If the latter is the case, you're stuck in a loop, and this thread is going to make things worse. If someone leaves because of unwanted attention from one person, more unwanted attention is not the answer.

Just realise what you did, apologise, and stop doing it.

People often send signals, or tell you outright when you're doing something that bugs them. If you care about preventing a falling-out, you have be somewhat sensitive to those things before it's too late.