I don't mean to disregard his concerns of unfaithfulness, we all have our fears, but I can't help but laugh when he goes on about me with another man. We don't get into a relationship to spend the entire time assuaging someone's suspicions. We get into a relationship to share something meaningful and cool, and it's impossible to do that when someone's pelting you with accusations. Jealousy is a control game. The minute someone pulls this garbage they sentence you to a servile role.
Nobody's at their best when they're forced to coddle a jealous lover.
The onus is on your boyfriend to deal with it. Unless you're intentionally provoking him by being a relentless flirt, it has nothing to do with you, and if he doesn't pull himself together, tell him you're going to kick his ass so hard his crap'll come out with a shoe print on it. There's a waitress to whom I'm attracted, but I'm not sure as to how to approach her. I wouldn't want to make her uncomfortable by asking her out while she's working, but the restaurant is the only place where I see her. Your grammar's a little clunky.