Been going out with a girl for about a month now and the sex is the best ive had (previous ones have been very inexperinced as im pretty young). But I dont want a LTR with a slut, how do I know if shes worth the time?

She seems to be really keen on me but often plays slightly hard to get which is fucking me off a bit. I wish she would be the one to initiate sex but it may just be because she is worried about pregnancy as she isnt on a contraception. Once I turn her on though she is full bore. How can I make her relax a bit and initiate more?

Also how do you stop oneitis? Happened to me earlier this year and dont want it again.

THanks guys