I've been with my BF just over a year and I've noticed that he sometimes (probably every 2 or 3 months) tells white lies, or lies by omission in situations where I would be honest. The lies are quite trivial and I usually only find out he has been lying because I'm a bit nosy. For example, twice he has said he can't meet me because he has too much work on and later I find out through talking to his work colleagues that wasn't true. Both times this happened after we'd had a disagreement so I think he wants some space but won't say that, whereas if the situation is reversed I'm honest and say I'm not really in the mood today can we rearrange for x.
Another example is as he was leaving my flat one day I phoned him to ask if he could come back to do something for me. He said no because he was already at his car, which was parked some way away. Actually, I say him from my window and he was still in my street probably only a minute away. Again, i would have said I couldn't do the favour because and given an honest reason.
Do others think this low level lying to 'save' someones feelings is ok or not, and should I challenge him on it?