<human>: Can you give me a shortened version of the text?

I've been jokingly flirting with a friend of mine for months. I assumed that she was happy with her SO [M], and that she was straight. Wrong on both counts. 

When I saw her this past weekend, she told me the following:

-Her boyfriend gets upset and assumes that they're fighting when she doesn't respond to his messages in a 'timely manner'

-Her boyfriend fakes anxiety attacks to get her to come over / call him

-Her boyfriend promised that their relationship would never be serious, and then started calling her 'his girlfriend'

-She very badly wants out of the relationship, but is worried about her boyfriend's mental health if they break up. 

-She is attracted to me, and wants to start a relationship with me. 

I told her that I was interested in her as well, but the conversation doesn't get to stop there. 

I also wanted to tell her the truth. "This guy is overly-attached and the relationship is unhealthy," that's what I would say to a friend. Unfortunately, this case comes with the awful addendum "You should dump him and date me." So I don't feel comfortable commenting at all. Now that she and I have expressed affection for each other I just stay quiet on the matter. 

So the choice presented is:

a) Be supportive of her. Tell her that if she is unhappy, she should leave. After we've expressed interest in each other, this is the dishonorable choice, and perhaps the fastest way for us to start a relationship. 

b) Be honorable. Stay quiet on the matter and wait for their relationship to dissolve of its own accord. This is the unsupportive choice, and perhaps the slowest way for us to start a relationship.

What should I do? Have I already fucked up by telling her that I want to be with her, too?

[She and I haven't done anything past holding hands yet. It will stay that way until she leaves this guy]
<bot>: A girl stuck in a bad relationship has expressed interest in me. Do I support her and tell her that her relationship is lousy, or do I stay quiet and let the two of them work it out?