<human>: Can you succinctly summarize the text in 1-3 sentences?

So my wife and I met in 2010 and were married in 2015. I'm 28 and I'm interested in taking a vacation without her with my close friend (also a Male). My friend (single) and I have known each other our entire life, best friends since 1st grade. This is the guy that has all but taken a bullet for me. Anyways, our whole life we have talked about scuba-diving in Mexico together when we get older (i.e. have jobs and money). Well, fortunate for us these criteria are going to met for the first time ever, this year. I've talked to my wife about taking these trips with him (~4-6 days) and she has a number of concerns. (1) It's weird for me to go to Mexico without her (2) I'm spending our money on a trip just for me and (3) I'm taking vacation away from us. 

My question is, is this really so selfish that my history (or life) does not justify it? 

Communication details: Before we got married I told her about the history my friend and I had (i.e. we promised to have these trips until we die). Since we've been married I've talked about it, but haven't acted on it. I'm starting to get concerned if we don't start now we will never do it. I'd love to hear someone on here say "It's ok, go! Here why. Excellent argument etc..."
<bot>: My lifelong friend (who's single) and I have had scuba-diving trips to Mexico planned our whole life, is it ok to go without my wife?