It took me a whole summer to get over my ex. After telling myself how I deserve better and how he's a slut, he started texting me again in the beginning of the school year. He got bored of me and started flirting with girls while he was with me. I feel as if I wasted the summer to only be built up and fall even higher. I don't want to fall for him again. Any advice on how not to fall for your ex?