<human>: I honestly don't know where to post this, but here it goes. My friend 'Tricia' wants to move in with a guy she's been hooking up with. Now she has a boyfriend who doesn't know about the FWB guy (we'll call him Frank). She has a really shitty home life (emotionally abusive parents) so I completely understand her wanting to move out. But she met this guy 3 months ago, hardly knows him really (just sleeps with him basically), and he asked her to move in with him, and she really wants to. They would be renting a tiny room for $500 a month (they would split it), however she makes barely minimum wage and I've tried to explain to her that it's going to be so expensive because she hardly makes anything at all. I offered to move out with her and rent our own place after she saves up a little and she seemed like she liked the idea but she told me that she thinks she's gonna move in with Frank. I've tried my best to convince her not to, I don't know what to say to her. She already knows it's going to ruin her relationship with her current boyfriend but she says she doesn't care because her relationship is already falling apart. I was actually looking forward to renting a place with her in the near future after I brought it up. What should I say to her to convince her not to do this? She's my best friend and I really cannot let her go through with this. 
Sorry this is all over the place, I'm on mobile and kind of freaking out over this haha.

Can you condense the text into three sentences or less?
<bot>: best friend wants to move in with guy she's sleeping with after only knowing him for 3 months, and she has a boyfriend.