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I am a bit confused to translate this sentence.

Can you figure out every word?If you do,I can explain the meaning for you.
1.Many Chinese people put great store by their 星座（constellation）today.So if你在看星座的时候，总是顺便把他的也一起看了.That means the person puts great store by him and cares for him.So this means the person喜欢him.
2.The second sentence is a little deep.In my view,I think that this sentence maybe wanna tell you to be easy.For ex,if somebody hurt you,just be easy and forgive him.Or for your early boyfriends or girlfreinds,just remeber him or her but need't try hard to forget him or regret.Just let those days become nice memoris in your life.
Those are my understandings~

1)" 什么叫喜欢一个人，就是你在看星座的时候，总是顺便把他的也一起看了。
What is liking someone? Liking someone meas when you read your horoscopes, you always read someone's also.

2) 有些人，有些事，记得就够，不需要刻意在乎。
Of someone, something, remembering is enough, do not need particular caring.

这已经是高级主题了。