Here are three things you can do to increase the amount of emotional connection with your partner:
1. The the first thing to appreciate is that your partner's withdrawal is not meant as an attack on you. They are afraid to feel into an important negative emotion and they have withdrawn to protect themselves from pain.
2. Do not judge or try to control your partner. It is love that will take away their fear. Therefore offer them compassion and make it clear you want to understand why they are moving away and are unwilling to engage emotionally with you.
3. Be willing to open your heart and feel into your own emotions, both positive or negative. In this way you will lead your partner in the healing and encourage them to be more emotionally expressive. If you have any problem in your relationship always be willing to move towards your partner in the spirit of love - this will always help matters.