how do i tell someone nicely to leave me alone?

Question

this feels like a primary school problem and i hate that im having to post this but anyway here i am. 
im 18 and in my second year of college (UK) and im in a very happy and committed relationship. 
we met in college two years ago and have been together for just over 10 months. there are two boys the same age who we both know through our classes and they will not leave me alone. one of them finds me attractive and won’t speak to me directly, the other relays messages from him some of which make me VERY uncomfortable. to put it simply they are trying to get me to engage in sexual activities and at this point it’s almost begging AND ITS EMBARRASSING AND AS MENTIONED VERY UNCOMFORTABLE. ive tried everything possible to show them im not interested and that nothing would ever happen. 
to me this all sounds so childish and pathetic but any advice would be appreciated :( thank you ladies x

Answer

just simply say, I'm happy with my boyfriend and im clearly not interested in anything you have to offer so please for the sake of the rest of your dignity, leave me alone and stop asking for something that's never going to happen.

Answer

Simple say a firm I’m not interested

Answer

Tell them firmly that you are not interested, that you are happily committed to your partner, and that nothing will ever happen between you.Then tell them that you feel that you have made this clear previously and that their comments and advances are not just unwanted they are making you uncomfortable. Next tell them that you need the comments and advances to stop. 
If they don't stop, then you need to kick it up the chain and report it to the lecturer/head of faculty. You tell them that you are being sexually harassed, that you have tried to put a stop to it but nothing has worked and that it is creating un unsafe and unproductive learning environment for you. 
If the university doesn't do anything or it is not resolved to your satisfaction, report it to the police as sexual harassment. 
If you go the more formal route, make sure you keep documentation of what has happened. Text messages, photos, emails, voice mails, letters, notes,  your diary enteries, note down the dates and times, get witness to write down what they have seen or heard. Also make a note of when, where and who you speak to if you go through university administration.

how do i tell someone nicely to leave me alone?

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