Have I made a fool of myself by being too drunk?

You made a drunk fool of yourself. You need to reapologize to your friend. By what she said you do this often so you might want to consider not getting drunk. I can't stand drunks! It gets old fast. Nobody enjoys having you around being so dramatic and unpredictable. Sucks for your ex too, you should if just ignored her if she bothered you so much. Make things right with your friends and stop being a drunk mess, you're going to push your loved ones away.