From being a thing to being in love

I have been dating a man for a little over a month. He is incredibly sweet to me, he's supportive, loving, understanding. On paper he's everything I could ask for and I feel lucky. But when I first met him I didn't really have an intention of being super serious with him (just because of where I'm at in my life.) However he had made it clear that his intention of being with me is definitely to be long term. I don't know if I'm just being guarded or if the flame isn't there. I like him, but I'm not like completely swept off my feet I suppose. I guess what I'm asking is if any of you have ever started dating someone without the intention of being super serious and end up falling for them hard? Should I be feeling stronger than I do at this point? Or is it okay if your feelings take longer to grow? I'm just curious to hear some of your experiences. Thank you!