Bi polar illness. my fiance left me?

hes been great for over a year..but no meds and some paranoia, which did escalate into daily arguments and him not feeling safe with me unless i did everything he said. i have been crushed for weeks, and he wants to be friends, then hes crying, then he dont want to know..my head is battered. hes also been following me around on here and on myspace. leaving me messages about him, pretending hes someone else. he had an injunction for ault on his son a few years ago....his son was in a coma at the time, and hes been arrested a few times for other stuff..which i only just found out. hes acting so wierd.like hes in control, but he isnt. am i mean to just shut him out. i have cried everyday, cos i really loved him..but now its making me ill, and he refuses to go get meds.