Why would someone do this?

I’ve been dating this guy for 3 months and we’ve gone on a lot of dates and had a lot of conversations about family life etc.

I remember him telling me on our first date his sister worked with special needs kids and at one point I told him that my baby’s father is a criminal defense lawyer.

our 8th date together we were talking and he says that his sister was studying to be a criminal defense lawyer and I remembered that he originally said she worked with kids so I look her up on Facebook to see and sure enough she works with kids.

why would someone change their own story to match mine?

Why would someone do this?
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