What do you mean when you say you dont have the same feelings as before? Look up the difference between infatuation and love. Most people have doubts at some point in a relationship. It doesnt neccessarily mean that your not right for each other. This could just be a case of thinking the grass is greener or it could be that he is not making you happy or fulfilling your needs.
Do you trust him, love him, also see him as your best friend? Do you have a good sex life? Is he reliable? Stable? Would he make a good dad? Can you lean on him when your going through a tough time? Do you have fun together? Laugh together? Do you have things in common? Does he work?
You need to decide what is important to you and how many of those boxes he ticks. If your just looking for more excitement (infatuation and lust) then you wont be able to maintain those butterflies with anyone. Infatuation always fades and thats when the emotional bond starts to form
"Don't ask a question if you can't handle the answer".