She also told me the situation is complicated and she has big decisions she needs to make.
Well... again. Could ask her what she needs from you at this time and get the clarify.
"What do you need from me at this time? Because I've noticed the change in behavior. Do we need to set a date for a serious talk? I'd like to know what to expect so I can prepare and clear time to talk. Are we breaking up? Do I fail to meet your wants and needs?"
It's not fun to feel how you are feeling right now -- so... let's just face the fears, and move it along so it moves forward.
Not endless limbo.
You are not a mind reader.