Given the weird occurrences posted here on FML, I wouldn't necessarily assume this was happening behind closed doors. But even if OP did something to slightly deserve it... I wouldn't say anybody deserves this.

Maybe the door was opened?

That is something I would not even share with God.

I don't think you can be too close to your partner. OPs dad needed help with his rash, that he couldn't see, so his loving wife helped him. It's part of being in a loving and comfortable relationship, these things come up once in a while.

They're married.. They're supposed to be close. There's no such thing as "too close" when you're married.