Love relationship

hi,
iam a boy and recently met a girl in a bar and start talking to her. I knew that she is a pros but still i kept meeting her and we devoloped a boundin between us. We talk for long everyday and she care about me but while she is on her work i feel very bad. I know i can't help her out this proffession but i am not able to leave her. She is the 1st girl i talked to in a bar and she became my last since past 1 year...i know she loves me but she cannot come out from the place she belongs to... I feel bad whenever we fight and the same happen there and the most shocking part iam going to disclose is that iam in a committed relation from past 7 years. But when i met this girl i was in very bad phase of my love life(almost breakup) and she helped me to come out of that..i am not going to marry this girl but still i love her gentle careing and calm behavier. please tell me help me what to do friends at one side iam committed and on other iam in love...what should i do?