Should I expect my ex to come back, again?

We were on and off for 2 years. He dated his ex on and off for 5 years before me and now he is currently back with her and living with her. He has gone back and forth multiple times over the past 2 years. He has me currently blocked like he usually does. Should I expect him to come back at some point in the future? I don't think they will ever work out but for whatever reason they keep going back to each other.
Should I expect my ex to come back, again?
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