We told each other we like each other, but we don't have time to date. We do talk everyday online and some days in person, even about a relationship in the future. Is she my girlfriend? What stage in a relationship does "boyfriend/girlfriend" start at?
When you both agree that you are exclusive with each other and would like to take things a step further (more serious). You have spoken about a 'relationship in the future', therefore you are not there yet nor in the near time... Maybe after many more dates and probably once hooking up, maybe that will seal the deal or you both have a talk about your status. But for now, you all are just crushing on each other.
The moment you're in a relationship is the moment either one of you bring up the topic and both of you make it official. That's when you're in a relationship ;)
I didn't consider my current boyfriend as being my official 'boyfriend' until we straight up discussed whether or not we'll be in a relationship, and are willing to take on any responsibilities that may entail.
I wouldn't say you're a couple because you're not dating. You just like each other, it's like when I was younger I wasn't allowed to have a boyfriend however we both liked each other, talked etc. It really starts when you have the conversation.
When you have a conversation about it and you both decide you are boyfriend and girlfriend and want to be in a committed relationship. Generally dating comes before a relationship but if you guys are good friends and have talked about it for the future than there's a chance you'll skip straight to boyfriend and girlfriend but you definitely aren't there yet.
Your talking baby talk. A relationship of going boyfriend and girlfriend can only be when the couple sees each other routinely, they do make every effort to do so and do not wish to be with any other person of the opposite sex. I would include having sexual relations that is optional in this teenybopper era
Relationships, dating, marriage etc. doesn't have any actual rules or numbers that define how they should go. You can't quantify love at all. People have dated for a week, got married and stayed together for 50 years. While others dated for several years, got married and divorced only after a few months. It's always up to you and your partner what stage you are in or what you are ready for.