25miles or so a week certainly isn't that much in the scheme of runners on this forum. But to a non runner, it probably sounds obsessional!
It probably comes as a bit of a worry when someone you've been married to for 12 years suddenly starts a hobby up that doesn't involve you, but that's not your problemo!
The girls I've gone out with who haven't run, always seem to think I prefer running over seeing them, however i fit it into my routine.
Having said that I do a leeetle more than 25miles a week, so it's probably a fair comment 
Regarding injuries, and talking about tough sessions, you have to learn that talking about them to a non runner is simply pointless, as you'll just hit a brick wall of "just rest then", or "you don't have to run", and suchlike.
Save the running chat for on here or other running buddies!