I think you should try not to panic. Sometimes things can become overwhelming in a relationship. It is fair and right to ask for things to be less hectic and to ask your partner to support you in this. He has been honest and truthful. If he wants to slow things down, and you want to be supportive, then I'd suggest taking things at his pace. If it turns out this is his way of breaking up with you, then you will know. As there will end up being no contact initiated by him. Take a few deep breaths and allow things to flow. By trying to push things you may well cause a break up, when all that was needed was a little time and space for re-adjustment.
All the best,