How do you know if your boyfriend is cheating on you?

my boyfriend acts like a douche bag and sometimes he is the sweetest guy on earth. he sometimes talks to this girl I know and he recently said you should come to my work to see me and stuff. he's never said ANYTHING about her and I know almost everything. I don't know what I should do. he swears he's not cheating on me but idk...maybe I'm just getting too jealous but he says that she's beautiful and such to her...HELP!
How do you know if your boyfriend is cheating on you?
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