I used to get that way about my ex boyfriend too before meeting my current boyfriend of almost a year (which treats me 100093908498974 times better) If you want advice, i would encourage you to try to stay away from your ex,maybe block him and take a break from social media and focus more on yourself even if you hate it. You deserve good treatment, everyone does. People who dont give you that are not worth the love, the time or the effort.