It depend on the lady as ladies varies with the ways at which they handle their different issues. Some are harsh till the end while some take it bit by bit so it depend on the lady involved.
U need cash and ur ex is always there for u to give d cash after sex. U love ur new boyfriend but he does not have cash to spend around for u. U just don't know what u want.
keeping boy friend and girl friend is a very good thing because it makes the both parties share ideas, know each other very well, be close, no lonliness, enjoy the good things between man and woman and so many others.