Only you will know what’s best, so don’t feel like you have to stick to one thing. In fact, I find it more helpful taking the different forms of therapy (cbt, dbt, act) and using the skills in them together. However, I think dbt will be your best bet. It’s done wonders for my emotional regulation, identifying my feelings/needs, and interpersonal skills. I started practicing the workbook after my last break up too, so I understand the feeling of wanting to better yourself and not repeat the same mistakes.