Should we go back to dating?

My life is so complicated right now.. how much is one person expected to cope with before having a break down!?! But here's the question: I've been together with my boyfriend (living together) for 3 years... He seems just totally self-centred. Although perhaps it's not his fault as he does have mental health issues. I've been so busy studying for my Alevel exams that we don't get much time to spend together. Today was the ONE NIGHT that we were meant to spend together- going to the gym and then spending time together at home. But he made plans to see his friends to get some cannabis. He did come to meet me to go to the gym but he was all depressive and saying it was an inconvenience to have to walk me home, and we ended up arguing and not going to the gym now he's out with the friends but says he's coming home tonight- which doesn't make a difference as i'll probably be asleep by then. His dope smoking is getting worse, but I can't nag him cos I don't have the time. I really don't know what to do. Should I move out and go back to my mum's but keep "seeing" him?? Maybe this way he'll appreciate how much I actually do around the flat.. and not make other arrangements when it's meant to be 'our night'....

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