My boyfriends going on holiday for during our 1 year together..im really worried?

Okay, so when my boyfriend goes away next month it will be just before we have been together for a year. The only thing is I'm worried what he will get up to on his 'big lads holiday'. Plus I'm not too happy that it was organised when he knew it was going to be when he said he would spend time with me. Do you think he's going out of spite or should I just not care and let him do whatever he wants?