ehm, that's actually mark, the boyfriend, im talking about adam, the bestfriend :)
ALSO SPOILERS
I only ever had Rebecca as a partner, since I haven't played Mark's route yet, but does Mark also kill Allie when he gets jealous or is it Sebastian that kills her? I thought Rebecca only attacks Allie (which gets Allie killed) and Mark only attacks Adam (which makes Adam quit his job) on the « cheating route », 'cause I could never get Rebecca to beat up Adam (kinda fucked up to say with no context LMAO) even if I made Adam answer the call when we're hanging out at the arcade.