Take a step back, go take some time for yourself, go do you for a bit. From his point of view, he genuinely thought he was doing the right thing by asking you to marry him.
Whatever he may have said or thought back then, is in the past. That doesn't necessarily think that he does think about it now like that. If you're feeling incredibly bothered by it, I suggest you should talk to him about it and share how you feel upon reading those messages.
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