Should I dump my boyfriend?

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My friend has been dating his boyfriend for 4 freaking years, kind of ling distance relationship. They only see each other like once or twice a month. The guy likes hanging out with his friends and she doesn't often get invited. She doesn't have any clue if the guy is cheating on her because she said that their okay together and she doesn't sense anything fishy. So i told her that maybe she got a problem with her senses. Of course she doesn't buy it and told me that maybe im just to neg bout the whole, okay so ...got tired of giving her advice... just let her do the talking. Then she told me she has been giving hints to th guy that she wanted to see him more often an nothing happens...clever...Since i'm so tired of giving her advice, I just ask her for the last time, Are you still happy like completely happy? Then she said no, so I told there you go, you just solve your problems. What do you think guys?