Did you know I'm dating two people at the same time?
For real? Do you love both of them?
Yes, but I can't choose between them yet.
You should choose one and not lead multiple women on. It is not good to date multiple people without letting them know about it.
I wasn't planning to tell them, I thought it would stay a secret forever.
Even though it is a secret, don't you think one day there would be a mistake and it would be revealed? How are they going to feel that you were two timing both of them? So how about either choosing one, or neither, to save them from heartbreak?