Welcome Hubby_1016. I'm not a Psychiatrist, but it sounds more like Borderline Personality Disorder than Bipolar. Either way she would need to be diagnosed by a Psychiatrist. Perhaps you could suggest a full medical exam by her GP including blood work. There are other medical concerns that can cause mental illness symptoms.

It may help if you put a time frame on wanting to see some changes. The first step would be outlining what your concerns are and explaining that you are willing to work on it with her, but if you don't see any changes within X amount of time you won't be able to stay with her. Your son needs to be your first priority, so if you aren't willing to do this for yourself do it for your son.