"和他相处很轻松" 可以用英文表达为 "It's easy to get along with him/her"。

"Easy" 这个词的意思是 "容易的，不费力的"，"get along with" 这个短语的意思是 "相处得好"。

例句：

I find it easy to get along with my coworkers. (我觉得和我的同事相处很轻松。)
She's a very easy person to get along with. (她是一个很容易相处的人。)

希望这能帮到你！