Is he into me or am I crazy?

So I've had a crush on a teacher (cliché, I know) since the beginning of the 2017 school year. We used to chat a lot, pick at each other, and he'd give me advice about my chosen field. People could tell I was into him, and I got a vibe that he was into me (and my vibes are very rarely wrong). But then someone made a joke about us being like an old married couple and his behavior changed. He doesn't sit with me and my friend at lunch anymore, and if I send him a message on Facebook he won't answer- and I very rarely send him things that are not about class. Is he into me and just being careful so he doesn't get into trouble, or was my vibe completely wrong?
Is he into me or am I crazy?
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