In essence, you haven’t actually allowed yourself to understand that the relationship is actually over.
As long as you still believe that the relationship isn’t really over and there is a chance that you will get back together with your ex, it will be very difficult for you to move on from your ex.
He is still into his ex when he is still calling her or texting her on a regular basis and he is doing so behind your back.
He is still into his ex when you notice that he can’t help but talk about her on a regular basis.
He may not always be saying nice things about her but the mere fact that he keeps talking about her is normally a very strong sign that he is still into her.
Your ex likes you when they prioritize working on the problems that you both had in your past relationship.
When you notice that your ex is taking things slow with you and is really focused on fixing those problems first without jumping right into another relationship with you, there is a good chance that your ex likes you.