Some people would say that once you have found your mate through an internet dating site and are happy as can be, that you should delete your profile and accounts from the various internet dating sites that you are registered with. Although, it seems logical, I don't think its prudent.
For one thing, you don't know if this is going to be THE long term relationship that you were waiting for. You need to give a relationship the test of time before you can honestly say that it is.
Let's face it, there were plenty of times that we have all felt that this was 'the one' only to be disappointed that it was not.
I believe at the very least you leave your profiles active on the free internet dating sites and cancel the ones where you are charged a fee for their services. No point in paying for a service that you no longer need or use.
That way, all is not lost. If it doesn't work out, not to worry, just get back on that horse and start out again. You don't have to feel so overwhelmed at the thought of starting out on the internet dating game again when you already have active accounts just waiting there for you to be used.