Guys, will you hang out with a girl alone if you are not interested in her?

Well if my leg accidentally touches a girl, I'm not going to just yank it away that's sort of rude, as sneakily as it got there is as sneakily you remove it. Guys who are comfortable with you and get in your space zone isn't doing it to be friendly, you are on his list, just not the top is what you your situation sounds like. If there's a cute girl you can be cool with that is kinda cute but your interest lie elsewhere, nothing wrong with becoming friends and getting to know the new girl, just in case? Just don't get too close or its friend zone.

I would, she's still a friend and if its brought up I stand my ground and say sorry but I care about you but I don't see us having a relationship.

if I'm interested I get close and talk to her eye to eye, if I'm not interested I keep distance and talk about simple topics that end the convo easy without mixed signals being sent.

I personally wouldn't so not to risk leading the girl on. Not all guys are that considerate. If I was interested she'd know and I would make it very clear. Otherwise, if I sense that there is more that the girl is looking for I would let her know I wasn't interested.

Yup. When a girl likes you, it's flattering. Everyone loves attention.

Signs he likes you- intellectual conversation, wants to get to know you personally, he'll make "moves" on you

Signs you're being strung along- you come over and clean his house, or make him food, etc.

Of course. I'm in a relationship, and want to keep my new friend in a platonic relationship. She is very nice, caring and thoughtful towards me, and would love for our friendship to flourish. She knows I am taken - it's not like I'm taking her on a cruise or around the world.