Up coming work trip with a co-worker

I'm 24 & currently living with my boyfriend. My company is sending me & my co-worker Andrew to training in Chesapeake, VA next month. We already booked separate rooms at the hotel. However, the training ends at noon on Wednesday and he's taking the rest of the week off because he rented a house at the Outer Banks and invited me to join him.
Andrew's 38, single, attractive and lost his wife in a car wreck 7 years ago. At work, we get along great. He talked me into joining the same gym and are workout buddies. My boyfriend won't go to the gym with me. He's into gaming and teleworks part-time for an IT company.
Andrew and I have hooked up twice and one time I spent the night at his place because my boyfriend was out of town at a gaming tournament.
Spending time with Andrew is different than with my boyfriend.
I want to spend the weekend with Andrew but I'm currently in my first serious relationship. Andrew has told me he's interested in a future and tbh I want a future with Andrew too. We have more in common.
What should I do?

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