First time with this guy

Gr

So I have been dating this guy for a few months. I really like him and feel very comfortable around him and he treats me really well. I’ve been with other people before, but this will be the first time I have sex with him. This is the most serious relationship I have been in and I’m terrified of messing it up. He invited me to his apartment and he is going to cook for me. Any advice to calm my nerves?