Search Results: initiating a break up

My good friend and I are moving into an apartment together in a few days! We're both excited as it should be a good fit. Of course there's the dreaded bedroom decision. The master bedroom is larger in size (about 15ft x 10ft). The 2nd bedroom is about 10ft x 10ft and has a larger closet. I'm not sure how to bring up the conversation as I don't want to lead into any sort of disagreement right off the bat, even though we're both agreeable people.

I believe I should get the master because 1. I'm moving in first, 2. I will be there 100% of the time, 3. I work from home 3/5 days per week and would be able to set up a desk area for myself, 4. Im paying the first months rent alone since she's leaving to Europe for 2 weeks and won't be moving in until her old lease is up in July, and I am also the primary resident on the lease, I found and viewed the apartment, I paid and initiated the applications and had to make sure she stayed on top of what she needed to send in and pay for.

I think she wants the master because she has a king bed and she also has a 7 year old son. BUT her son primarily lives with his dad. She usually visits him where they live a few hours away, but occasionally she'll bring him up for a weekend during his school breaks. I told her if she decides to bring him up more often, i am more than happy to watch him while she works. She also has a long distance boyfriend who visits rarely as he's from the UK (we're in the US) and I won't really have visitors. She is looking for a remote or hybrid job also, but she currently works at a bar.

I think the decision is obvious, in my favor. However, the conversation hasn't come up yet and I just don't want to create any bad blood. I even offered before to pay more of the rent since she wouldn't be there as often but she refused and said we'd split it 50/50, after the first month.

How do you think this should be brought up and who do you think should get the master?

We broke up few weeks ago
(He initiated it because we kept arguing a lot)
We haven't contacted since

my ex boyfriend hardly put anything on public on his facebook profile

Until yesterday
He posted a song on public

These are the lyrics:

Is he aiming this at me?