You seem to be caught in this state of limbo: you refuse to let her go and move on, yet you do nothing to "clear the air" and obtain what you think is closure. Yes, checking her FB page is stalking, especially since a) you know it's her old/secondary profile and b) you check it on a semi-regular basis.
Either you remove all final traces of her from her life (store the pictures far far away) and make an effort to move on, or contact her to get your so-called closure. Or seek professional help.
Buddy, I tried for months and months to talk to her to clear the air. Do you know what my requests to talk with her like an adult were met with? Silence, being blocked, or sub-tweets about how much of a "dick" I am. My messages were nothing but sincere and from the heart. Contacting her is a dead end. You're nuts if you think I sit here wishing the air was clear and I did nothing about it. She refuses to talk to me at all, like I'm some sort of monster. That's where this comes from. I've had trouble coping with the fact that she treats me like a demon. That's the 180 I mentioned.
I've made many efforts to move on. In fact, I've come a VERY long way since she left me over a year ago. I've spoken to a professional several times. And because I now know she updates this old profile of hers, I won't ever look at it again (just as I never look at her other active social media pages). Sometimes people tell me that she'll talk to me again one day. I highly doubt that.