You don't. What kind of sister & friend are you as to where you'd want to make someone think that? If YOU don't like her boyfriend, that's none of your business. She's not dating YOU, she's dating HIM. If you're that cruel & can't leave her relationship alone, sit her down & calmly explain why you don't want her with her boyfriend. Remember that her relationship is not your business or decision though.
Ok now what kind of cheater are we talking about? A cheater as in he/she cheated in a game? or a cheater someone who cheated on you? Well the first one keep your eyes on him/her make sure you know what he/she does in the game your doing. Well the second one is a cheater who cheated on you with another girlfriend/boyfriend talk to them try to follow them around secretly and make sure that they don't know. Try to convince them that you think you think they are seeing someone else. Make them tell you.
Either drop him or make him wear a condom you never know what you might pick up.
Buy him a massive house!
Lie. Bury the guilt and make sure that he never finds out.
Lie and tell him you cheated on him... he'll tell you just to get even with you.
It's not healthy to manipulate someone into feeling guilty. If your boyfriend cheated, it's important to communicate honestly about how you feel and make decisions about the future of the relationship based on respect and honesty. It's okay to seek support from friends, family, or a therapist to process your emotions and make decisions that are best for you.
That is more of a personal decision you need to make based on your relationship and if you can recover the trust that was broken when he cheated.
What you may think is a good boyfriend for your sister may not be what she is looking for. You only see the surface of her boyfriend's character while she knows him much better than you do. It may also be that the chemistry is not there for your sister and you cannot make yourself love someone that you are not in love with. Each person has their own road of life to go down and they will make mistakes, but hopefully learn from them, but many people also know what is good or not good for themselves when it comes to a relationship. It is best to simply back off and let your sister make her own decisions about what type of young man would be good for her as a boyfriend.
Thanks for sharing...I guess. Make it an question.=p
No that would just make him more upset! well its your opinion on what to do.
Make them think your happy, be confident. Think of all the great things about you and in the end it's his loss. You if it was something that hurt you so bad you need to get back at him that will break his heart 100 times worse. Its your call.
She is your boyfriend's sister and you are immature and have no self confidence. His sister is no threat to you and there is no need to be jealous of her. If she meddles in your business with her brother then you need to tell your boyfriend to speak up and deal with the matter at hand.