Worrying doesn't help. If you are in treatment, and are committed to improving you'll be able to sustain a successful relationship. A lot of the accounts of people you hear from here are with someone who quite frankly is out of control. There are likely other cracks too in the relationship that we don't hear in the posts. I had and have relationships with some people with bipolar. Not romantic ones.
To be honest, it can be hard for the other person sometimes. I heard someone say that bipolar is a selfish disease. I agree. I also think that can be said about any condition that sometimes leads to the unexpected or just requires people to be more understanding. I have experience with my own!
So many people are different. The bad accounts don't foretell your future. It doesn't mean people will always walk out on you. We all experience some of that during our lives anyway.
You have bipolar. As my therapist said to me, "stop pathologizing yourself" when I was feeling that I was a condition or a sum of symptoms. You're still you, just with bipolar. That's the way I would hope you would see it. It's not a kiss of death. Many people with bipolar are also loved dearly.
You won't read all those accounts here! This forum is essentially for advice about problems (real or imaginary) or to vent. That's my opinion from posts I wrote and ones I read. They are often written when someone is exceptionally frustrated or feeling wounded.
I love my sister-in-law. She has bipolar. She can be so energetic and excited about things sometime. It's a nice quality to have.