How do you know if someone really is into you

well im 16 years old and im confused im a girl who likes girls okay I have this friend and we been friends for about a year now and I told her I was a lesbian and she said she was straight we both excepted each other differences okay one day we had a basketball game and it didnt end till 11pm we get on the bus and she lays on my arm and falls asleep I guess so I get comfortable and out of know where her hand touchs my thigh im thinking okay no harm so her hand moves closer and closer to my vagina we made out once she got there I was so confused a couple of days after we became more sexually active with each other I fell in love but she said she didnt love me but every weekend we would have intercourse no questiones I feeel like im being used what do I do

Any kind of sexual contact has to be based on some kind of understanding between the participants and it doesn't work well unless both have caring feelings and commitments toward each other. If you have to ask if you're being used, you are.

You should sit her down and try to find out how she really feels. If she's unwilling to have that discussion, I'd leave her alone until she does. Otherwise she'll find someone else she doesn't care about and you'll be left out in the cold.