It’s a little hard to answer in my current relationship because we haven’t bothered with the ‘official date’ things. We’ve been dating for six weeks to two months, and depending on the date you choose you could say I decided I loved her before we were actually dating.
With the above caveats in mind: two weeks ago, we’d been seeing each other for about a month. In the interest of not scaring her off, I’d made a conscious decision to let her say it first. She did, and a few days later she rightly told me that my decision was unfair because it put all the pressure on her - especially since we were both pretty sure of the other’s feelings by that point.
I think that in my high school-era relationships I did say it too fast; I figured you had to be in love with someone if you were dating them, which is probably a mistake a lot of people make at that age. I don’t think it created any problems and that was an error I had to make in order to learn more about what love actually is.