The most direct way to tell someone to stop following you is to simply say "Stop following me!"
If you are especially angry at this person, using the word "please" is not necessary but if you are trying to be polite to somebody who might not understand that they are bothering you, saying "Please stop following me."
"Leave me alone" is another way to tell someone that you don't want them to be near you. It can be used in many situations, such as when you don't want someone to talk to you or to be in the same place as you.
誰かに付いてくるのをやめてほしいと直接伝えるには、単純に"Stop following me!"（ついてこないで！）と言います。
特にこの人に対して怒っている場合には、"please"という単語を使う必要はありませんが、相手が邪魔をしていると理解していない可能性があり、丁寧に伝えたい場合は"Please stop following me."（ついてこないでください）と言います。
"Leave me alone"も、近くに来ないでほしいことを伝える別の表現です。話しかけてほしくない場合や同じ場所にいないでほしい場合など様々な場面で使えます。
"Go away.", "Stop following me" and "Leave me alone." are all expressions used to tell someone to stay away from you, Not walk close to you or to stop fallowing you.
"Go away."
（あっちへ行って）
"Stop following me"
（着いてこないで）
"Leave me alone."
（一人にして）
これらの表現は全て、相手をあなたから離れる事を促す時に使えます。また近くを歩いたり、着いてくる事をやめさせる時。
Quit' - means to leave doing something permanently. Therefore, when asking someone to 'quit following you,' you are telling them to stop altogether and follow a different course. The same message is conveyed when you tell someone, "Don't follow me!"
You have to be stern when you tell this so that they know that you are serious and will report them to the police if they continue doing that. You can use the following sentences:
Stop following me.
Go away.
こう言うときは、あなたが真剣であり、相手が辞めないなら警察に通報することを知ってもらうため、厳しく言うべきです。
これらの文を使っていただくことができます。
Stop following me.（ついてくることをやめて）
Go away.（あっちへ行って）
The three sentences you see provided above are terrific ways to express to your listener to not follow you. In the first sentence you will see the word stop and in the third sentence you will see the word quit. Both of these words mean to not do something. These words would make great additions to your vocabulary.
Are you stalking me? STOP Immediately! (or I will call the Police.)
STALKING is an offense: If at anytime one feels threatened...
You are advised to speak out in a LOUD CLEAR VOICE: Are you Stalking me?
Advise the offender to "BACK OFF!" or the Police will be called!
More" legalese like" is shout directly at the target... "CEASE & DESIST!"
THIS IS A COMMAND telling the other party:That you are ready to make it a police matter."
"Back off!" is the most commonly used venacular...
If someone is following you that you don't know then it might be frightening so you would want them to stop it is not always what you say but how you express/say it if you use a harsh sharp tone then they would know you are not happy
'stop following me!', 'Leave me alone!' or 'Go away!' would all work well for this
知らない人について来られたら怖いですね、やめるように言わないといけません。何を言うかではなく、どう言うかが大切なときもあります。
厳しく鋭い口調で言えば、不愉快に思っていることが伝わります。
'Stop following me!'（ついて来ないで）
'Leave me alone!'（ほっといて）
'Go away!'（あっち行って）
これらはどれもこの状況で使えます。
If you keep following me, I'm going to call the police.
Please stop following me, and leave me alone.
Because this is an uncomfortable and sometimes scary situation, it is okay to be informal. However, you can still use the word 'please' when stating your demand or request. If you are being followed by someone you do not know, then you can tell them to stop following you and let them know that you will call the police if they do not go away. If you are being followed by someone you do know, then you can simply tell him/her that you want them to stop and to leave you alone.
これは不快で時に恐ろしい状況なので、インフォーマルに表してもいいですが、ただそれでも、命令・お願いをするときには、'please' が使えます。
もし知らない人に付けられているなら、ついて来ないよう言い、「ついて来るなら警察を呼ぶ（call the police）」と忠告できます。
もし知っている人に付けられているなら、シンプルに「ついて来ないで、ほっといて（leave me alone）」と伝えられます。
アメリカ合衆国 
南アフリカ 
イギリス 
カナダ 
