jillyZ, you are fighting bravely, but your situation reminds me a bit of one of those situations that discern different methods of behaviour in men and women:
A gal comes home just before having to leave to work, and hubby asks: "Where have you been all night long?"
She replies: "Sorry, had no time to call, just slept over at a friend" and goes to take a shower.
Hubby (not really a knight) snitches her agenda and phones up her 10 best friends to ask whether she had slept over indeed.
Result: Out of 10 calls made, none of the girls could confirm that she had staid there last night.
Now, lets assume for a moment this happens to men also and look at it from the other perspective:
Guy turns up in the morning, same excuse, leaves for the shower. His wife (not a real lady either) does the same thing on his agenda and asks his 10 best friends about last night.
Result (and here is the difference that you are currently suffering):
Out of 10 guys, not only will 7 straightaway confirm that he had spent the night there, but the other three will additionally adorn it with something like: "Sorry, he cannot come to the phone atm, he is under the shower"
This said: 69
Rattler