all started when his girlfriend moved in
She is probably bossing him around barking orders, etc. Probably ordered him to clean out the garage, sell the race car so she can put her car in there. Because she is connected to the system, he can't bully her around. Now he is stuck driving the brats all over the place, can't take the drugs he used to or bang the cleaning the lady, lashing out on GB, seeking out Curlfriends wherever they might be.
It all makes sense now.
He used to smile a lot and laugh, now he just seems miserable.
Bhanks - kick her out - call off the wedding, etc. Better times are ahead.