It can only be narrowed down to a few motives in regards to MJ. One being that he was upset about having to move. Another is that MJ overheard something in PB's phone conversation to (who ever she was speaking to) when PB said, "yeah, he here, he doing laundry. That statement allows DB to know that MJ will be around the apt with PB for some time alone or with little bro. Maybe DB didn't want MJ to be around PB for a long period of time for what ever reason. Also, although it's stated that DB and MJ were on rocky relations, by MJ continuing to reside at apt, they were probably continuing to be intimate at times. When a 'NEW' female comes around, men always check her out. Nice body frame, young and naive. Most times boys and men attempt to see what they can get away with (becoming bold) when they are drinking and smoking (best friend green). Sometimes when men are rejected but see someone else has scored, they feel less than little. At times feeling disrespected because they were not allowed to score. JMO