hit it off 相处得好/合得来

Mary and Tom met at a party last week and hit it off.
玛丽和汤姆在上周的聚会上认识的，俩人很投缘。

on the rocks 恋情告急/恋情出现危机

My relationship with my husband is on the rocks.
我们夫妻之间的感情出现了问题。

pop the question 求婚

I really love my girlfriend and I'm going to pop the question.
我很爱女友，打算向她求婚。

tie the knot 结婚

Last week my friend and his girlfriend tied the knot.
上周我朋友和他女友正式步入婚姻殿堂。

fall head over heels 爱到死心塌地

We fell head over heels for each other.
我们深爱着彼此。

puppy love 早恋/少男少女间短暂的爱情

Don't worry, it's only puppy love.
别担心，不过是少男少女之间的短暂迷恋而已。

settle down 成家/安家

When are you going to settle down?
你打算什么时候安顿下来？