okay I'm so worried I might not love my boyfriend anymore

Like I do love him I do we've been together for 1.5 years and he's my first love and we are so happy with each other. We live together and always enjoy hanging out with each other, and like we really are in love with each other. We fight a lot tho sometimes and rarely have sex anymore. But i recently started working in a new job and there's this guy I work with and I'm so attracted to him and I can't stop thinking about like kissing him and I often think of scenarios where my boyfriend would dump me and this guy would kind of slide in that quick??? And I don't know why I think these things!!!!! I love my boyfriend I do but I'm like worrying that my heart is falling out of love before my brain does

Like I don't want to fall out of love with him I want to marry him!!! But I don't know what's happening ! 😫

P.S I'm so stoned and freaking out and I need help with this