Search Results: how to get a girlfriend

2004 was my favorite year. 2005 was quite decent. I moved in 2005 in the middle of 5th grade. 6th grade had some challenges but was OKish. 7th grade was the beginning of the decline. By the time 2008 rolled around going forward, I was in a severe and sharp mental health decline. I was going in and out of psych hospitals. I was told adulthood would be better. That couldn't be farther from the truth. At 18 throughout most of my 20s, I was in severe mental and emotional anguish. The involuntary hospitalizations continued.

By age 29, I managed to get my first real girlfriend and serious relationship. I am now engaged to be married, but I am far from normal. I still struggle with mental health issues and now physical health problems as well.

The obvious answer is “no” but hear me out:

I go visit my family for a few weeks after being away for quite a while.
I find out my younger brother of one year is practically juggling two women and playing the long game with both in hopes of getting one to be his girlfriend

Woman A is gorgeous, she’s also into him, they hooked up once already, he likes her too, it’s great. But she’s a little toxic

Woman B is a “rebel” with the tattoos and the metal bands and the easy going lifestyle with promiscuity and drugs and whatnot
She’s not into him at all.
He wants her, but isn’t settled on it.

Then I come on for a while and Woman B is all over me.
Under any other circumstance I would’ve spent half the vacation in a bed with her.

So I restrain myself as the good brother.
But I can’t help but wonder if I’m doing the right thing.

My brother has every reason to want woman A and she wants him too.
And yet he’s created this needless friend-zone wrinkle with woman B and it’s going nowhere (and I don’t think it should considering her lifestyle)

Part of me wants to fuck the socks off of woman B and I can’t deny it to myself.
I get the appeal but I wouldn’t date her long term. And she doesn’t want that either clearly.

So what would you do given this scenario?
Please give some reasoning and detail