I’m in a great LTR but another guys come and drawn my attention hugely. help?

I’ve been with my boyfriend 5 years. He’s amazing and kind and attentive. He’s also perfect for me, he just fits in with my life and family so well and we get on amazingly. He’s good looking and I love him.

Then I got a crush with a guy I work with and it developed. It’s continued to develop and is now a huge infatuation. We went on a staff night out. When he was drunk he told me he really REALLY liked me and he thought I was cute.

I’m all over with this and can’t stop thinking about him. We have a lot more in common than me and my partner and what makes it harder is me and the guy live in each others pockets. What should I do?
I’m in a great LTR but another guys come and drawn my attention hugely. help?
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