Most Helpful Guy
Most Helpful Girl
Being you work together and were once "Together," no harm in sending a friendly text just to Check up on how he is doing? He most likely will respond with just a hymn and a haw but at least you would have showed a side of you that he unfortunately will never get to know.
His silence will probably stay not so golden, you may never really know what's eating him up inside unless you both would sit down and talk about it.
Good luck. xx