I don't think I've seen Matt having PTSD from Murderous Pixie Dream Girl Elektra. Specifically the 'mindfucking him then leaving him to drag himself home to get medical care before he bleeds out, only to be waiting in his shower to have dorm room-destroying sex with him while he's still messed up from blood loss'
That could fuck a guy up. He probably wouldn't want acknowledge it because he did consent and have a good time (though he wouldn't if he'd known how many people she'd killed)
He might not even understand it until Foggy says something that reminds him of her and suddenly he has Foggy pinned against the wall in a not-very-sexy fashion.