It is essentially a contract where two people agree to stay together through thick and thin, for better or for worse.
Invite your guy and his crew to hang in a big group.
That way you can get a feel for what he's normally like around his buddies and it'll let you both relax a bit more.
Relationships are not always what it may seem for other couples.
There is always that risk of cheating by one of the partners.
I actually had one girl, while we were in the middle of a conversation, look over at another girl and say, 'Eww, look at that girl's dress.' The way she said it sounded so bitchy and I wasn't into it at all. The guy will almost always hold the door open, pay for dinner, etc., but it's still nice to hear a thank you and know that it's all appreciated. I've almost come to stop expecting them so it's especially nice when I hear them.