Inform her if she locks you out you will pay for a hotel and deduct that amount from what you pay towards the rent. She will be expected to make up the difference. She is very welcome to go sleep at her parents or anywhere else she wishes but you will not be manipulated into some nonsense.

No offense, but you really need to work on self-awareness. You have a boyfriend but are purposely allowing the advances of another man. Then, clearly try to use these advances to manipulate your boyfriend. Then come here and complain that your boyfriend didn't get jealous???

This is so messy it's sad. Your new friend is obviously ok with being the other guy or breaking up a couple. You are obviously ok with surrounding yourself with people like him. Your boyfriend is pretty apathetic towards you but from where I sit, this could be him being a jerk or could just be him protecting himself from your messy and immature nature. You are already borderline cheating.

Good luck though....

I get why she is upset but it's a 50/50 problem. You two have real compatibility issues and at this point you seem to both be wasting eachother's time. She has zero respect for your boundaries and has made it clear how she wants to live. You have not really addressed that at all and just put a giant stop sign on all progress in the relationship. This seems to just be a true waste for everyone.

For the record I think she is the weird one. In fact super weird, but that's her right.