1. It is always a risk in indulging in casual sex without thinking the consequences out of it.
2.Now if the aldy lodges complaint then you can be prosecuted for the offence of sexon promise of marriage, rape and cheating and the police can arrest you in no time.
3.Once arrested getting bail in such cases becomes difficult for some time.
4.So resolving the dispute amicably is only solution.
Else I regret to inform that if the lady goes to police your life can be spoiled for good part of it.