I need advice

So my boyfriend's ex told me and him that her aunt died, of course I didn't believe her because she lies about everything. Then I told him about what she was saying to me because it was more than just about her aunt, then he drops the freaking bomb that his dad might be dying and of course i feel bad but im still on this rant with his ex. Then he goes, tells his ex what im saying and all this and now she's getting mad that I don't believe her and that im going on to him when his dad is dying. Then I mentioned the fact that 'they are just friends' and she has his password to his phone and is going through his phone without asking and that he is telling her everything I told him and now she's going off about a bunch of crap that im controlling my boyfriend, when on the other hand I let him talk to other girls, *** other girls, follow other girls on ***, text other girls, I let him do anything he wants but some how im still the 'controlling' one. And he is still fed up with his ex, he does everything with her and when she acts all lovey dovey with him, he does nothing to stop her. What do I do?