Afraid of his reaction

So after having sex today with a guy I am just getting to know I decided I want to wait until marriage to have sex again. I have a feeling he will see this as an excuse because he doesn't see sex as a sin. I like him but I am afraid of what his answer will be when I tell him my view on this now. I felt extremely guilty after having sex and just want to wait till marriage I know I should have said this before it happened but I didn't know I wanted this. Please no hate I am already feeling like trash. So what should I do if he sees This as an excuse or doesn't want to wait that long/ make me feel guilty? Just leave or should I stick up for what I believe? Thanks