My boyfriend is going on holiday to Cancun, Spring Break for 2 weeks without me?

Anonymous
Please help. My boyfriend is 26, I am 22- we've been together 3 years now. He told originally told me he was going on holiday to "Mexico City" for "8 days" with his friend (who is single). It then transpired, after overhearing a phonecall to his friend (his voice is loud), that he's going to Cancun. Today, after 3 weeks, he's told me he's actually going for 2 weeks (during Spring Break). We have never gone on separate holidays before. I am really upset because he has lied and he told me he lied because he knew I wouldn't be happy. I know he can cheat anytime if he was a cheater but Spring Break just seems totally inappropriate for a mid-20s guy who is in a serious long-term relationship.

He got married at 20 and has a daughter. He told me he wants to just do one last holiday before he settles down because he hasn't really "lived". This upset me more because I said I shouldn't be punished for his past. I am 21, i said, what about if i want to go away? He would never allow me to go away for 2 weeks alone. He told me he wouldn't like it because "he'd be worried about me if I got into trouble or hurt". He said if I don't let him go he will just go off the rails in future, he said he will not cheat on me etc.

I have to be honest, I love him so much but i'm scared as 2 weeks feels so long and girls flaunting themselves at him etc. It just makes me feel so worried already and it's still 4 months away. I don't want to dump him as that gives him a total free pass. This is the man I was planning to buy a house with next year. I just feel like he wants to go away for one last hoo-hah before he settles down so god knows what he'll get up to and won't tell me when he's home. Also 2 weeks is so long (for us) considering we've never done this, we see eachother most days. I think I am overreacting but just feel upset about the whole situation.
Updates
+1 y
He tells me "he loves me" "will never cheat" He says he didn't actually think his friend would have booked it as they were only discussing it. He says if he wanted to cheat he could just do that here in the UK. He said he just want to enjoy the holiday, sunbathe, drink, fish etc but it just seems so inappropriate. I don't know how I'll cope for 2 weeks alone.
My boyfriend is going on holiday to Cancun, Spring Break for 2 weeks without me?
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