<human>: Could you distill the essence of the text into 1-3 sentences?

Ok so, I am a freshman in college and am planning on moving out of the dorms and into an off-campus house/apartment. Now the kicker is that its a 2 bedroom and I'm planning on moving in with my ex because shes really my only fiscally responsible (and shes responsible in general) friend and we still get along fine.

I'm not interested in her anymore and we've both moved on and gotten new SOs and are both happy with our new lives.
We've been talking about moving in together for purely monetary reasons (I'd be paying ~ 300 dollars less for the apt than I am for my dorm atm (and I want a real kitchen)) and I'm not sure how to bring it up with my new girlfriend, who I have been dating for a month or so.
<bot>: Moving in with my exgf to get out of the dorms for purely monetary reasons. Not sure how to bring it up with my new girlfriend.