Help me 😭

Soooo I’m in a relationship been together for a full month I like him.. well actually love him and we’ve been having problems like any normal couple butttt it gets deeper I have a co worker who has a crush on me and is pursuing me & it gets worst because I am a little attracted to him and my body is responding to him sexually and mentally I feel I want him I just don’t know what to do and I’m really just confused cause I don’t wanna hurt my guy & I don’t wanna hurt the other guy cause he is genuine & just a soft kindhearted person