It means that as long as you are honest and forthright in your dealings with others, you should have no worries about these things coming back to bite you later. Kind of like paying your taxes. Simply saying when you can something done get done.
I don't think this young man has anything to gain by breaking dates with you and he is just shy. There are more young men out there that are very shy and find it more comforting to IM, Email, etc.,...
When someone says he "never" can do something, it means he thinks it's impossible to do it. But nothing is impossible and people can do things that they thought they never would do. So this phrase...