We weren't made for each other.
我们不合适.(言外之意:我想你不合适我)
I don't think we should see each other any more.
我觉得我们不该再见面了.
I don't think you.are the right person for me.
我觉得咱们两个不合适.
I want to see other people.
我想我该换换人了.
I want to break up with you.
我想跟你分手.
It's over.
结束了.