Too Fast?

So I've never been in a serious relationship before and now I finally am. I've liked this guy for three years now and we always kinda had a thing going on. Back in October we first started dating. We dated for about 3 months and then we broke up. I was heartbroken. The guy I've liked for years broke up with me because I didn't spend enough time with him and we never talked, which was even worse then us just growing apart. After a few months we kinda started flirting with each other and on night we stayed up all night just talking until about 8 am. Then right before we said goodbye he asked if I wanted to be his girlfriend, and I said yes. After dating for month (it'll officially be a month tomorrow) and flirting with each other for three years I realized that I love him. I honestly don't know what to do though, there's been plenty of moments where I could have said I love you but I got scared because I feel like it's to soon. On the other hand we are all about things coming naturally like our first kiss and saying I love you so I don't know what to do... I'm confused especially because I've never had an experience like this.