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Believability includes not making your boyfriend seem too perfect. Although you don't need to list out his flaws along with the good things, you should limit the good things so you don't seem like you're exaggerating. Everyone has a complaint about their significant other from time to time.

Any illusion has a better chance of working if you put extra thought into it. Because friends are going to want to know more about your boyfriend, you should prepare a believable personality for him. What does he do for work? How did the two of you meet? What are his personality quirks? If you're going to act like you have a boyfriend around your friends, you'll need to dig beneath the surface and concoct a well-rounded story.