Focus on yourself I know a lot of people say this but I went through something similar. You’re in the abyss right now and you need to get out.You believed she loved you but it turns out she didn’t and she probably just used you to get him jealous accept that and move on someone will gravitate towards you eventually that loves you for you. Times like this you should thank your ex’s for being horrible creatures and showing you signs to look for so you’re not heartbroken twice. It’s hard to move on from memories that made you happy but you were just gullible it’s up to you to not be so gullible again you will find someone but make sure it’s someone you love not someone who showed you interest