Is my ex spying on me? What does it mean?

When my ex broke up with me, the same day or next day a girl added me, i knew they went to the same school, but didn't know how close they were. So, yesterday my ex posted a picture and it said, they are friends since 13 years. Now, since the day the friend added me, she hasn't talked expect for 2 hours the same day. Me and my ex broke up last April. Now, my ex blocked me a one months after breaking up and then added me a month later and we met 2 times, texted (flirty) and called 2 times. She met me and called me behind her boyfrinds back and family. Then the boyfriend foundout and forced her to block me. Later around one month later, my ex's sister added me on snapchat for exactly one week. She didn't message me or anything just added me and then left. (i use to talk to her sister, but after me and my ex broke up we blocked me). Me and my ex broke up becuase the relationship got one-sided, and my ex kept it going while it was one sided. My ex loved me more than i loved her or love myself. Now, when we met the second time, me and my ex started talking about the reason for our break up, she was acting as she doesn't care, she was making good eye contact. Also, throught the time she was talking, she asked me 2 times if i found anyone. Once, i confronted her ask why she cares, and she made some random on spot stupid reason. Now, i also, asked her what we are, and she said, "you can think of us as friends, if u want, but i dont" which means, my ex doesn't want to be friends, neither does she hates me or anything. Now, does this mean my ex wants to get back? does she miss me? Was she spying? and if she is, why is she spying? Can she be planning to come back?
Is my ex spying on me? What does it mean?
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