Asked me to be his girlfriend on the first date... should I be concerned?

JAMW1
We are both 24... met him online did not really talk online. I texted him.. he called...we talked and set up a date not even a week later. We met and he was smitten with me off the bat based on his body language. I ended up skipping work and hanging out with him the entire day. He asked me to be his girl and we have been together ever since... now a month. Should I be concerned that he made me his girlfriend off the first date and that I accepted :S I have never done that. He is constantly calling he does text but he always calls. Sometimes its just to call and say he misses me. To be honest I don't feel like a spark or crazy connection and sometimes when he kisses me I am kinda just thinking when is he going to stop. I do like him but I think I am starting to wonder about whether or not we moved too fast... he is talking about marriage and moving in. Damn I know we are older and I want all of those things but I don't want to be a rebound we both have been engaged before. What can I do to figure this all out?
Asked me to be his girlfriend on the first date... should I be concerned?
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