Is it normal to celebrate a six month anniversary?

I'm curious. I've been dating my boyfriend for 6 months yesterday, and he didn't seem to remember. A week ago he was acting like it was kind of a big deal, but then he forgot about it until I reminded him last night. He acts like it's no big deal, which to him maybe it isn't since his last relationship was > 3 years. He should know that it's kind of a big deal to me because I've never dated anyone that long before, I'm always quick to dump someone in relationships before I lead them on too long if I know it isn't going to work out. I'm literally having one of the worst months of my life, so I'm being sensitive to every little thing, but I don't know if it's normal to be a little bothered by this or not. It makes me feel unimportant I guess, because 6 months at least feels important to me. We didn't do anything, I sat in my room programming. woop deeee doo. Also, he just recently started saying "I love you" but he rarely says it, so that's been bothering me too.