Is farting in bed a sign of being comfortable with someone?

Last weekend my boyfriend came down (we live about 2 hours away from eachother) he is going away for the summer so we wont see eachother for a couple months. But next year we're going to college together so we're going to live together = ) I'm really excited. Well anyways when he came down here he kept farting haha. It wasnt like it smelled bad or anything I just wasnt used to seeing that side of him. We have been dating on & off again for about 2 1/2 years. He knows that next year we're going to live together so I'm thinking he's just becoming more comfortable with me and wanted to see how I would react to things like that. But I dont know. Is it weird.....or is it just a sign of being comfortable with someone?