How do you know if a guy just wants to fuck you?

Anonymous
I'll keep this simple. I just need some foolproof signs that will let me know if this guy just wants to have to sex or if he's actually interested in me & wants something more than just sex. I know certain things that would usually let anyone know & that a blind person could see 'he clearly just wants to fuck you' - but this guy says he wants more & wants to take it slow because he likes me so much that it actually freaks him out. I mean, we haven't even kissed, just talked at work & text almost every day. He's hesitant to ask me to hangout outside of work & he's said it's because he knows that the type of people we are with each other - we would end up fucking & he thinks we don't need to go that fast just yet. We get along really well & just seem to click but sometimes he'll say & do things like flirt with other girls right in front of me that make me question his real intentions. I'm just confused & need clarity - how do I know if he's serious about me or just wants the physical aspect?
How do you know if a guy just wants to fuck you?
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