Struggling on the right decisions….

My boyfriend and I of 2 years have recently broken up. I left the beginning of January but then we still talked and seen one another until 2 weeks ago I stopped all contact. He has “narcissistic characteristics”. It’s definitely been a roller coaster especially the last 6 months. He has seemed to accept his faults and wants to work on us again. I can see some change, however, idk if it’s for good or if he’ll go back to the old ways… I wish I had a crystal ball that would tell me to try again or stay away. I feel deep down he is truly my soul mate and I would rather find happiness alone then to keep him if it’ll continuously be the same roller coaster. Idk what to do… :(