I’m sure I’ll come off as a bad person

I(24)have been with my boyfriend(25) for a year and a half, we are completely in love with eachother. Spending all of our time together. Sometimes it gets boring and we just spend time apart and I sit in the room doing nothing. I recently became infatuated with my coworker(30s?) he reminds me of my boyfriend, but this guy is very mysterious, quiet and from what I know sounds really exciting, I couldn’t stop thinking about him all week, and still cant help getting giddy at interactions I have with him. I don’t know what to do about it. I love my boyfriend so much and don’t want to hurt him. I also want to be with him forever but this guy is so tempting