SO CONFUSED!? IDK IF MY BF HAS STARTED DOING CRACK CUZ OF STRESS OR FROM JUST BEIN AROUND IT, HIS DIFFERENT?

His bipolar but his different everything triggers him now n yes just started hanging out with a crackhead but just cuz he steals stuff for him. So lately everytime the crackhead comes to the house sayin lets go so i can steal watever u need, my bf is so quick to take off. He hasnt really been him self, we try having but its like he tries to force it [cant really get hard] he is to rough sometimes. N most of the time wen we r tryn to have the crackhead knocks n my bf will leave at times just for some "money". His been hidin alot more from me. Idk it seems stupid for thingking his doing crack since his bn hangin wit the crack head but i do worry alot. Just someone please help me wat r the signs for this, can crackheads even get turned on while on that or how bout his anger besides from being bipoler or just anything help please. Its driving me crazy. Just a reminder if he is doing it then would be a begganer so how would i know??????