He may have a genuine reason but if it happens almost every time it is a sign he is a player. You are lucky to have a nice considerate man for a boyfriend.If he brags about himself a lot about how many girls he went out with before you, or how many did he 'nail' down before you, he is undoubtedly a player. He will tell them how lucky he is to have found you.But players rather will show you off as an object of interest to their friends.Just ask him for a dinner out at a crowded restaurant or a movie and see his reaction. He will check his phone too often in between conversations will be obsessed about his looks and will always talk about his life.If he insists he would rather spend the time with you alone at his or your place, it is time to run away. He will show little interest in yours and even when you talk about yourself, he will not listen to it with a great interest like a guy really interested in you would.He will introduce you with pride and say things like 'isn't my girlfriend a bombshell? Oh no; actually I am kind of busy sweetie this weekend. Guess what he already has a date with someone this weekend.
Okay once in a while he looks at other pretty women, no issues. Problem starts when he checks out other women at all the wrong places. He will want you to get drunk and lose your sensibilities for him to take advantage of it. But instead of telling you how adorable you are or how beautiful you look, if he keeps saying 'you look sexy' or 'you are hot', he might be a player.
He will not care if you drive back alone after getting drunk and insist to buy drinks after drinks for you. Guys know that women do not like to get touched unless there is that special bond between them. If he touches your arm or thigh or holds your hand too often while talking to you and pretend it is just normal, beware!! Talking about sex can be sweet and you too like it. But if doing it is the only thing he talks about all the time, it gets irritating. A real boyfriend would always to introduce you to his friends with a lot of respect.