I'll take a crack at it.
Start with the apartment. Large, open(?), nice and you and your GF are in it together, like your relationship. Wide stairs to the bedroom, no difficulty getting to the bedroom

Kitchen Restaruant, the kitchen is where you get food, nourishment, nessesity, I think this might mean the nessisities of your relationship are regularly availible.
The Ho came into the apartment and was cute. Something introduced into the relationship that would usually be considered tempting but potentially harmful. You didn't do anything, obvious. Ho leaves, the temptation was fleeting. Ho comes back, your feeling anxiety that the temptation may come back to harm the relationship despite the fact you didn't do anything. Your Gf eventual acceptance is similar to how you think she would react even allowing you to keep (whatever). Your not allowing it to interfere. The key is what the Ho symbolizes. I have no answer for that. Could be anything, not nessisarily sexual either.
Does that sound right?
cause I just pulled it out of my ass