You should read Rules & Regulations §6.15B and follow the steps provided each time you want to add new roommates.
The landlord cannot increase your rent because you are an original tenant on the lease even if the girlfriend is moving.
To paraphrase David Mamet, the landlord business is a people business. It’s a fucking people business.
Master tenants make me mad when they rip off their roommates or their actions, knowingly or ignorantly, place innocent roommates’ housing in jeopardy.
Sweet Jesus, Mary and Joseph! Tenants: Never, ever rent a room from an absentee master tenant!