My (28M) girlfriend (24F) just told me she has bipolar 1. How do I navigate this new part of the relationship?

I (28M) have been dating someone (24F) for a little over a month. Things progressed quickly... we really connected, spent a lot of time together early on, and recently made things official. I genuinely like her and have been happy in the relationship so far.

On our sixth date, she told me that she has bipolar 1. This is the first I heard of it. I wasn’t upset at the reveal itself, but I was surprised that it came after we committed to each other. I understand that mental health is deeply personal, and she may have been scared to disclose it too early, but I’m trying to process what this means for the relationship now.

I don't know exactly what her regimen looks like in terms of medications but I know that she sees a therpaist. She told me that she would always keep her highs and lows from me but I don't exactly know how that works. She also mentioned she likes to "ride the highs and lows." That honestly gave me pause. I don’t know what her manic or depressive episodes look like, how often they happen, or how it might affect us longterm. I’m not judging her, but I am trying to be realistic.

I’ve dated people in the past with mental health challenges (anxiety, disordered eating, etc.), and while I know relationships aren’t easy for anyone, I’ve sometimes taken on more emotional weight than I could handle. I want to be supportive, but I also want to avoid repeating old patterns where I sacrifice my stability for someone else's needs.

I’m looking for advice from anyone who’s been in a relationship with someone who has bipolar 1. What should I ask? What should I watch out for? What would you have wanted to know early on?

TL;DR: Girlfriend revealed she has bipolar 1 after we became official. I care about her but want to be realistic. Looking for advice on what to expect.