Remember: In a relationship, you are in a situation where you each affect each other. So, when you push, that probably feeds his withdrawal. When he withdraws, that feeds your panic and need to push. Both of you need to work through how to better communicate. But each of you may have to work on this individually before you can more effectively address it as a couple.

Start the dialogue though - slowly - without pushing to hard. How can each of you help the other?