If she is sure she wants to wait to see where this is going, is that selfish of me to stay in the relationship ? Do I cut loose ?
Yes, if you're not sure she's the one, cut her loose. These are her fertile years, she will be aware of her window to settle down, get married, have children etc. and it's just not the same for men.
Its all very funny to take the piss about women trying to tie down their poor man when he just wants to 'chill to and see what happens' but men don't have the same pressure to fit their life into a short window of opportunity.
We're only too well aware that once we hit 30 our chances of conceiving and carrying a healthy baby start reducing by the day. Did you know that a woman over 35 is called a geriatric mother?!
Imagine being faced with the knowledge that if you don't settle down and start a family in the next few years you're more likely to suffer complications, miscarriage etc and your baby has a higher chance of congenital abnormalities like Downs Syndrome etc.
This is why women are generally more keen to move things along, its not because we're desperate to tie you down against your will, its because if we want a family we need you to commit - shit or get off the pot, as the saying goes. Sounds like you're not ready to shit, so get off the pot and let someone else have a turn!