There's loads of lapdancing threads on here lately.
Somehow, something that used to be for seedy perves in Soho, has become seen by some as a normal, laddy thing to do.
I don't think it is. I'd go nuts if OH had one. I understand why you are so furious, especially with you taking care of a sick little one - that's really rubbing it in.
But life goes on, and I take it you aren't thinking of LTB.
I'm not a huge believer in forgiveness in most circumstances. That doesn't mean you hold a grudge, it doesn't mean you change your feelings towards that person, but to me forgiveness only counts and is necessary in a couple of circumstances
a) someone made a genuine error (dropped a plate and broke it) and is genuinely sorry
b) someone made an error of judgement in a minor matter and is genuinely remorseful, has learnt that it was an error, and would make that decision differently in future.
Any other circumstances and I'm not interested in their 'sorry'.
B could apply here if believe your OH understands why he was wrong to do what he did (not just being sorry that you are cross) and isn't going to do it again.
It might take a few days to get to that point though.