What are the boundaries between friend and lover?
It depends whether you kissed already or not (lol). Some time ago I was talking with a friend about what's the difference between a friend and a girlfriend. In the case of marriage the status changes by law becoming officially wife and husband, but when you're dating you only have a spoken promise. That's subtle. That's why I think you're lovers when you kissed. It's cheating if it happens after the kiss. If my girlfriend goes to eat out with a male friend I wouldn't like that but I'd understand.