Are we really not compatible or with his new partner they are compatible?

Theng, he and his new partner actually are incompatible. They can love for enjoyment together. However, it's impossible for them to get through hardships together.

You two match each other actually. You have many things in common. The same ideal and concept make you two together. And you can fight together for a bright future. However, your problem is suspicion and sensitivity. If you both can learn to trust each other, you will spend your life till the end.