Depression Treatment Care

my ex gf and i dated for 3 years. she broke up with me a couple times, and hooked up with a couple of guys, then came back. same thing everytime. she broke up with me abou 4 months ago because she said she wanted to be “alone”. she hasn’t been “alone” the whole time. she hooked up with someone a week after we broke up. and 2 months after we broke up got a new boyfriend. they’ve been dating for about 2 months now.
everytime we break up, after a while she comes back to me. i don’t know if that will happen this time. the last big break up we had, we still talked a couple times a week and hung out a few times over the 5 months we were broken up. this time, she never talked to me unless it was to flip out on me. but recently she had come in contact with me although she still has a boyfriend. she asked me how i was doing and stuff. i don’t know what this means.
she has been diagnosed with bipolar and does not take meds. i just want to know how do i know she is really going manic during these stages and not just being a ****? How can i be sure that she will become depressed this time and want me back? how do i know its really bipolar? it sounds a lot like it.
how can i know that there will be a depressed stage because she has been manic for about 6 months now. last time it only lasted about 4. does it do different things everytime? is a depressed stage definetly going to come?
anyone with experience with bipolar or bipolar exs please help.

swarovski crystals

could this be dangerous for me?

I dont think it will ever happen, only in a song.