FA broke up to work on himself or was it just an excuse?

Time will tell if he meant what he said, but it also doesn't matter. He's not ready or willing, and after a year and a half, that's more than enough time for an emotionally healthy person to know how they feel about you and show you they can show up when the going gets tough. He is not, which is not fair to you, so waiting around will be a waste of your time. If you are secure, it will still hurt because breakups, loss, change, and transition still are painful, but you will recognize that this is not a reflection on you and the why doesn't matter. The outcome, that he cannot show up for the relationship you want and deserve, is what matters.

Also, the support for boards are for people who have an FA attachment style to ask questions about themselves and how to work on their issues. You may want to repost on the general Fearful Avoidant board, unless you are also FA and want to discuss how you can find healthier ways to cope.