That’s hard; it sounds like she didn’t want to hurt you and so ‘forgot’ as a way of avoiding being honest with you and potentially having a difficult conversation. It’s hard to believe she didn’t have any feelings for you if she kissed you and you were in contact so often, but given that she seemed a little ambivalent at the time (was spending time with her ex, etc) and also going away to another country and having her own adventure, it’s not so strange to think that she was not thinking deeply about you and your relationship. Chris Rock did a bit about (excuse the vulgarity here) how women sometimes have male friends as an “emergency dick in a box” for when they’re lonely. This may be what you were to her.

As someone above pointed out, you were both using each other, which I believe is fairly normal in relationships. You asked her to make a decision and then you both moved on somewhat in your lives, and she made the decision, albeit in a pretty disrespectful way.

It would hurt me, too, if I was in your shoes and someone announced on FB that they were involved with someone else. That does show a lack of respect, and I would probably stop contacting her, as well, if I were you.

I don’t blame you for being hurt. I hope you can move on and heal and realize that you deserve someone who is as devoted to you as you obviously have the capacity to be to a partner. Ambivalence is painful. Consider this a lesson for the future.

Wishing you lots of healing!