First, you should give him some space for a while. He would probably like to cause some form of debilitating damage to you right now. After that, call him - don't make your first contact face-to-face.
If you got into a fight with your brother's girlfriend then tell him that if his girlfriend doesn't straighten up you'll break them up your self but if it's less complicated to say sorry then do that.;]
Very carefully.
be like "it not what you think she my cousin , but in her country we make out to say hello
Sorry, I have a girlfriend = Es tut mir Leid, ich habe eine Freundin
as a friend I'm telling you this as i care for you, but sorry to say your boyfriend is being unfaithful to you and unfortunately he is cheating.
you should say that you are sorry for what you have done.
If she is cheating on you, she is not really your girlfriend. Do not try and teach her a lesson, it belittles you. Your relationship with her is not going anywhere, simply drop her and look for a new girlfriend. Do not say why you are doing this , simply say she is not the girl for you and it is over.
im sorry to say this but he already have a girlfriend and her name is RENA KOMINE
Find a different guy. If he's staying with a girl because he's sorry for her, it doesn't say much for his emotional maturity. You can do better. Besides, if he says he loves you, isn't that cheating on her? How could you ever trust him?
If it is your fault , you say sorry . JUST SAY SORRY! Even it it is not your FAULT . Send her flowers , anything . Cheer her up!
It is always good to say "I'm Sorry" to anyone that you have done wrong regardless of how you feel about the situation.
Say oops sorry always out than in I all ways say.