This assumes Matt was diagnosed as bipolar or with some other disorder in uni. Foggy knows exactly what Matt can get like when he's off his medication. Foggy made sure to help Matt keep up his medication a few times when he 'slipped'. Matt is hardly helpless but he appreciates the concern when none others will.

After Nelson V. Murdock Matt stop taking his meds.

Daredeviling after a manic episode is not good.