I constantly think about my ex which makes it SO hard to get over him?

Be patient with yourself. You are totally normal. There are always things about an ex that we fondly remember. Go out with your friends and socialize. Get involved in fun activities. If you will let go of your focus on your ex and start celebrating your life, you will see the reaction from your friends and potential special guys. Be sweet, upbeat and ready for all that life has to offer. You have a great future ahead of you.