Agree with SirMe. Also keep in mind that fighting for a relationship takes 2 people. The cold hard truth is that one person can’t salvage a relationship on their own no matter how hard you try. Both people need to make an effort in some way. If you think you are fighting for a relationship, you really aren’t-except in your mind. It’s an illusion your mind creates so you don’t have to accept that this person is truly gone.
Hoping that an ex comes back to you while distracting yourself with other things is sort of like running in place while trying to get to point B. Your mind convinces you that you are moving but you are actually at a standstill just waiting for your ex to return. You need to fully accept the loss of your ex and only then can you move on.