POF dating app! Girls please help..

Claudia • Freedom is the essential part of my life!
So i meet this boy for like 4 months in POF the dating app. From all of the ones i meet he was the only one that respect me and actually makes me feel like old times good relationship! He ask me to be his girlfriend 2 weeks ago. He is not that romantic. We haven't got into the sex part yet. But i don't know why i don't feel comfortable with him? Maybe is bc we have 4 months to know each other? I haven't date no one for a while before him so i feel weird thinking i have a boyfriend? But girls idk why i don't worry i feel this way when he have been an awesome guy to me. How you girls feel about with your boyfriends by 4 months of knowing each other? How can i break the ice?