Most Helpful Guy
There are two major reasons for jealousy issues.
1. Trust. From what you say, that's not an issue here.
2. Insecurity. If you're insecure about yourself, you're constantly subconsciously afraid that he'll find someone better than you and kick you to the curb.
You need to realize and accept that he's with you for a reason. Because he wants to be. No other woman, no matter how attractive you think she may be, is going to change that. as long as you two have a healthy relationship.
As for the drinking, just ask him to keep it in check. Tell him you'd appreciate if he didn't get blackout drunk, to the point where he could lose control over his own actions. Throw in some tidbits about how you really like him, and you don't think you could deal with him making a mistake. Getting drunk is fine. If he is really into you, he won't be tempted to do anything wrong. However, Getting black out drunk basically erases any inhibitions he may have. And it makes it very easy for him to do something he could regret later.