Boyfriends mom and Facebook?

I recently found out that my boyfriends mother, whenever my boyfriend was in a relationship, added the girlfriend on Facebook and used to comment on posts.

I've been with my boyfriend for ten months and she hasn't added me on Facebook and still has most of my boyfriends ex's on her Facebook.

Who she adds and deletes or keeps is not my business and this isn't the issue. My issue is that I am being treated differently to the other girlfriends even when I make an effort to be respectful, sweet, thoughtful towards her. My boyfriend says she likes me, but I'd beg otherwise considering the above. Am I right or am I overthinking this?
Boyfriends mom and Facebook?
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