Ex Wife problems. She is making it hard for me to move on....?

The ex and I were married for 15 years. She re entered the work force about 2 years ago and fell in love with a married co-worker. We divorced shortly after me finding out about the affair. We have been divorced now for almost a year and a half. She was truly in la la land for a while. Really found her soul mate. But for the entire year and almost a half of our divorce, she has not failed to come to me at least twice a month with tears in her eyes saying how much she misses me and our family. So the other day she had to drop some things off at my house for the kids. We had been getting along really well for the past 3 weeks or so. No fighting, only texting about the kids and so on. So anyway she drops off the stuff at my house and I am not there. She texts me this:

" Kids bat bags are on the porch. Please know I hate you for real!! "

My question is, if her and d-bag married dude are so damn happy, why dd she take the time and energy to send me that? I have heard that the opposite of love is NOT hate. The opposite of love is indifference. Does she sound indifferent? She had the affair, she wanted the divorce. Why doesn't she just leave me alone and allow me to move on?