When to start opening up?

Hey, ladies. I’ve been talking to this guy I’ve met while I was on vacation and it has been going great so far. We’ve met about a month ago. I, however, have abandonment issues and it’s even harder when I have my overthinking moments because we’re far apart now (I’m in Asia and he’s in North America). I like him and I want to try to make this work (he does, too, he tells me).

I was just wondering when should I start opening up about these issues? Should I even tell him? Or just let things the way they are now? I’m fairly inexperienced when it comes to relationships so I really don’t know what to do. Thanks so much.