First and foremost; do you trust her enough to move out with her? Can you picture her being a responsible adult with bill, utilities, groceries etc...? If you are not even sure about that forget about the whole thing. Has anything physical happened between the two of you? kissing, spooning, cuddling etc.. I honestly do not know whether or not she really has a boyfriend, she might just enjoy having you around due to the attention you give her. Nothing better then knowing you have emotional control over someone. Seems like she has a decent amount over you. Do you ever find yourself being in denial when thinking about her in certain ways? Seems like you are clinging on to the prospect of you two eventually hooking up. Which would not be a problem if you weren't so emotionally attached to her. The Fatal advice: Try to figure out what exactly her relationship status is. Be more chill around her, do not show any signs of jealously at all. Be her friend and eventually work your way into something. If you two live together eventually and are alone one night drinking I am sure something is bound to happen. But in the end it's all about what you really want and what the truth of the situation is. There is nothing wrong with taking a emotional risk and going after something, as long as it does not ruin your credit or hurt you financially. Find out more info about her relationship status please and post it here. Oh yeah, never ever bring up that other girl around her.