DAE feel uncomfortable breathing their SO's exhaled air when in very close proximity?

I can't help but fixate on the fact that it's happening. It's not that it's bad breath - it's just the fact that it's breath in general. No matter what, it's different from breathing air at a distance from another person (in smell, temperature, etc.), and I also think "this air must be more carbon dioxide than usual. I'm sure it won't hurt me at all, but now I'm thinking about it."

This is only when, like, cuddling or something when your faces end up right by each other.