<human>: Can you give me the gist of the text in a nutshell?

I've  been with my SO for over a year now and we are expecting a child in august. His ex of 6 years liked a photo on my instagram of me holding my baby bump. I don't  know what to think about it, it kind of creeps me out. Why would she like that picture? I haven't told my SO and dont really want to because I'm not about drama, and I dont want him starting something with her. I've never met her nor do I have a problem with her I just find it weird. 

A little insight on how our relationship started. We were both in other relationships when we met. We were both working in a different state than our ex's.  Developed feelings  for each other and just broke it off with our other relationships. Neither ex took it well my ex kind of just dissapeared after but I know it took her awhile to leave him alone I still think they talk but not alot and I don't  really care that they do.
<bot>: Why would she like a picture of me pregnant with the man that she loved, especially since I do not know her and the circumstances of the breakups? Is she fucking with me?