You've known her for less than a week but she seems to enjoy hanging out with you. She knows that you have a girlfriend who you've been with for a long time.   (.....................a girlfriend and that you've been together for a long time)


Actually, when you told her she was a bit surprised though she tried to conceal the feeling. Whenever you ask her out, she always makes it a group activity, bringging her friends along and it makes you (feel) a bit uneasy at times but she takes good care of you, introducing you to her friends and always getting you involved in their conversations. She's single and do you think she likes you (but) and if you leave your gf to be with her, do you think she will accept you?

But - would be my choice in the last sentence. As it is it doesn't sound right, she's .. and you .. and if you leave, then question.