am I being emotional or? (fiances ex)

My fiancé and I are expecting a baby in April and we've been engaged for almost a year now. He has an ex that is still good friends with his mom and his mom has her on her Facebook. I noticed EVERYTHING my fiancé is tagged in, she immediately likes. But any other post she doesn't bother paying attention to. Any picture, post, tag, anything. And it bothers me. Am I blowing this out of proportion or would you all be annoyed too? 

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