Learn how getting an ex back is often purposefully drenched in artificial complexity and 7 powerful ways to decomplicate the whole thing.
Learn what anxiety is, where it comes from, how it screws you over, and how to overcome it so you can be more confident and less fearful.
Your ex is not special. The faster you get that drilled into your mind, the easier it will be to let them go, rebuild your life, and move on.
Be yourself is terrible advice for most. What you should do instead is work toward becoming the best, most attractive person you can be.