My first relationship, it took me forever to say it. We had been dating for six months or around that long, and I knew I had strong feelings for her, so one day after school, I just randomly said it. Thankfully, she hugged me for like five minutes, said she did too, etc etc, it was such a great feeling to know that it was mutual, and someone cared about me as strongly as I did them. Now, I've also been on the other side of that spectrum, where I rashly said it to another ex who I hadn't been dating for long, and she didn't feel the same way, and that actually helped end our relationship. Not that I regret saying it, because after I did, and got rejected essentially, it made me realize that it wasn't the same feeling I had in my first relationship, when I truly meant it.