Honestly, I know given my previous posts it seems hypocritical, but you should both keep well away from the lecturers in question. Particularly if they're married and/or have kids. It *can* work out, but it's a chance in a million... and breaking up a marriage is just below the belt, particularly if there's children involved.
Probably would be better to stop trying to find reasons to talk to them and find someone more accessible, who you can actually be with.