Advice needed, bipolar partner

Hi, I would appreciate some advice. My partner of 9 years is bipolar / scitzoaffective disorder. While things have been bad in past we were able to revert to a period of mostly stability. But this year (due to cannabis use) it has been very bad. The last 6 weeks has been unbearable. In a psychosis state he nearly killed me about 4 weeks ago, and last week he took 2k from me ( without me knowing) and bought a ticket on the next international flight. I came home from work and realized he had gone. He is now sick in Europe and while he is with his father his father is saying he can't cope with him and is trying to send him home. I love him very much and want the best for him but after the incident of beating me, combined with the almost compulisive lying over drug use (which I have zero tolerance for) I'm not sure if I can cope anymore. When he is here I now sleep in a locked room, fully clothed and ready to run out of house if need be. He knows the effect cannabis has on him and promises not to do it but does anyway. I'm very patient and forgiving, but now I feel he just plays on my better nature. The problem is that if I give up on him there is no one else left to look out for him as his family are no use and his connection to friends (apart from his drug idiot mates) are all through me. Sorry to dump this, just at wits end. Thx J