Any guy or girl that gives there passwords out are complete idiots. I know so many people that do that and then it just ends up screwing with the relationship because you have the need to constantly check up on each other all the time.
It may show a sign of trust that he would offer that, but in my opinion I would not recieve the gift of "the password" because inevitably it will break that trust by sneaking around his emails.
Anyways, back on topic. Yes, I would be a little worried about that. I might confront him about it; saying that you were just testing it out and you found something really odd.
Evil School!!
May not be on LF as much, due to unforeseen circumstances.
Blame College and Homework for Everything!!
-Fawn