I am sorry to read about your experience, sending lots of love and positive vibes.
There's a better future ahead of you, one that you can make yourself without the worry and the trouble you've experienced with your ex boyfriend, trouble and worry you would continue to experience were he still in your life.
I can relate to how you are feeling at the moment (I have recently had a similar experience), but look around the stories and comments on this forum to help you get clarity, support and strength. There are a lot of people on here who know what they are talking about.
Stay strong and believe me when I say it does get better in time.
Big hugs and love