Teacher acting odd towards me? Inappropriate or just friendly?

Anonymous
So I have this really clever funny attractive teacher that I've been really friendly with, as we have similar personalities and I get on well with and on occasions babysit his 9year old son. Now I've described him in a way that makes it seem like I have a crush on him, but he was kinda like a big brother.

Until recently. He broke up with his life partner about 6 months ago, and since then he and his son ask me over for movie marathons and things, which is fine, but I went to a school party all dressed up and he made comments like "you're stunning, you look really gorgeous," and at school the Monday after the other teacher complimented me on the pictures they had seen on his phone, including ones of me and his son.

Now here's the thing. I didn't know he had ever taken a picture of me. Is it completely inappropriate or simply innocent friendliness?
Teacher acting odd towards me? Inappropriate or just friendly?
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