When a girl asks you to be her boyfriend?

I've been seeing this girl for roughly a month. We've gone on a few dates but mostly we have a lot of sex, has to be over a dozen times now.

The other day she asked me if I thought we could be more serious like boyfriend-girlfriend.

I told her I wanted to wait a bit more so we wouldn't make haste decisions.

I just don't like the idea of being in a relationship after a month and then say it ends a month later. I've previously dated women for roughly a couple of months and I do not refer to them as ex-girlfriends because I think it magnifies how many times a person has had a real relationship and failed no?

I've never seen two women sexually at the same time, and I told her I only care about her for the time being and would be upset if she was seeing another guy.

But I just think girlfriend-boyfriend is more official than I am ready to be at the time.

Or am I wrong?
When a girl asks you to be her boyfriend?
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