4. Come up with a pretext to call him on a weekend night, and see if he’s free
“It’s a huge relief when his prompt answer to ‘Is this a bad time?’ is ‘Not at all.'” So, one way to get an idea of his situation is to call him when you would expect to be interrupting something. Calling without any particular reason may arouse his suspicions, however, so make up a plausible excuse in advance.