My partner said he did not want to continue the relationship aft

My fiancé told me that he does not want to continue anymore and I need to move out in 2-3 months. I need help!

My fiancé and I have been together for over 3 years and we have announced hu*****and and wife to people. We have had great 3+ years and we have been very happy together.

We started trying for a baby in 2010, but had two miscarriages. We were both devastated when the 1st one happened in Feb 2011. It took us over 2 years to get pregnant again, but I lost in in April this year when it was 9 weeks.

We both have very stressful job. He was working on taking more accounts to build his business in the past couple of month and finally it happened earlier this month and has a commitment for another 3-5 years. He is under a lot of stress lately.

For the past few weeks, he seems to be drifting away from me. He told me a few weeks ago that he was nervous of having a baby. We did not really talk about the baby/pregnancy matters after my miscarriage. I have been under treatment since December. 3 weeks ago he said he wanted to put off the pregnancy, and he has a lot to digest. I told him that I was not getting any younger and being 36, I may not get pregnant if I miss the opportunity. Over that weekend, he turned to a stranger to me. He said that he had been a bachelor too long and can't adjust, and he does not want to have kids.  

2 weeks ago, he told me that he has been very unhappy and did not want to continue the relationship. He asked me to move out of his house within 2-3 months.

I do not know what made him make this decision, as he is usually a very reasonable and rational individual. Is it that he does not love me anymore or is it just that he did not want me to miss the opportunity so that he wants to set me free?

He has been very cold and distant to me since then.

What can I do to bring him back?