My ex girlfriend of over a year broke up with me 2 months ago. She's been seeing this guy since two weeks after our break up and since then it seems to be getting strong between them. She seems to be happy with this mew guy but from time to time she does things like hack into my Facebook account. Also last week she just messaged me saying her son said hi and has just been making excuses. She knows how hurt i am so why does she do these sort of preventing me to move on in which I explained to her. She also told me that she does this on purpose.