I'd probably keep the two. It might be useful to have a spare, if you are switching tunings, and you might even find you prefer one for some things and the other for other things.

It's not rude not to lend an instrument to others, it's your right and choice.

That said, personally, I'm not fussed about pristine and am very relaxed (paralytic drunk might be an exception) about who I lend instruments to.