Is he the one??!!

My boyfriend and I were on and off all throughout college. After we broke up for about and year but still kept in contact. In May we got back together and have been the best ever!! We both had a lot of growing up to do and it was hard going to a big party school. We both really value family and marriage and have talked about it. Lately though we’ve been fighting a lot (I’ve been switching between bc and it’s made me so crazy) but he’s been super great. This last week though we were talking about planning ahead for the future and he says he’s not 100% sure I’m the one and he needs more time. Should I be freaking out? I truly think he’s my person but it breaks my heart he doesn’t feel the same. I get some people need more time and he’s a very logical person. Idk is it normal for one person “to know” and the other to have doubts???