As a partner of Adoptee

Hello,First of all, thank you for sharing your opinions here. It's so helpful for me - a partner of an international adoptee- to understand my partner.He and I have been together for over 2 years nowI am mid-40 female and he is mid-50.Before I met him, I was married with a child for 15 years and he was never married in his life.Over 2 years, there were so many issues between us. I found most of them were quite unusual.One of them is his mood and behaviors change so quickly. One morning we feel so intimate but a few hours later he acts like a total stranger.Also, whenever we had a small argument, he used to list up all of ex-girlfriends and compare them with me, criticizing how terrible I am. Sometimes, when he got angry, he used to dump my stuff from his place (like clothes, toothbrush, etc) into my home door.Seeing them, I thought he wanted me to go away. So I suggested breaking up. But he suddenly changed his attitude and begged me not to leave him. Later I got to know that he'd been with numerous women in the past but it was always very brief. The most difficult thing is that he doesn't open himself after 2 years.He says he can't open himself to me unless he is convinced that I will never leave him. In order to understand him, I've started to read books, forums, and research regarding adult adoptee and their romantic relationship.I am losing hope as the relationship can't go deeper without opening up.But I love him and I would like to understand him more. Would love to let him know I am here for you.Please share any tips, your experience or advice if you are in a similar situation.Thank you in advance.Shine