Hold up, I actually kinda see your friend's point here lol. Your brother's wedding is a huge deal sure, but your best friend's 30th is also a once-in-a-lifetime milestone. You had months to talk this out with your friend and find a compromise, like maybe flying to Austin for the ceremony Saturday morning and then heading to Dallas for the party Saturday night. Instead it sounds like you just picked a side and let the bridge burn without even trying to build a ladder. Your friend probably feels like you didn't value their history or the effort they put into planning this big party for you. Sometimes being "fine" about it just means you're avoiding the hard conversation about why you let that friendship go so easily.