Your husband sounds a bit too volatile for my liking... turning up at work honking his horn 8 times! He shouldn't do that. Your boss might take affront. I would be well pissed off if a partner did that to me. As for the invisible thing, well, you just had a hard day at work. You are looking for your car. You are not looking for your partner. It is like when you see someone out of place. You recognise their face, but because they aren't in their normal environment you cannot place them.
He should have honked once or twice and then got out of the car and met you. If it was a SUPRISE then he should still have met you rather than honking at you. You honk at people you are picking up, not people you want to make feel special.
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The last thing I want to do is hurt you. But it's still on the list.