Deadpool even EXPLAINS this to you through jokes directed towards Cable.
As for Cable's reason for doing this, you could also call it a plot hole, or unrealistic, that he would sacrifice his life for Deadpools.
2 things.
First.
He just saw a man perform the ultimate sacrifice and gave his life to change things for the better. A purely "selfless" action (which is also explained to you through direct dialog in the movie)
It's much more compelling to sacrifice "your life" for someone, after just witnessing them, doing the same for others.
And that being said, Cable didn't sacrifice his life, but rather going home to his family. So "his life" in broader terms.
Second.
He mentions earlier that mankind in the future, between now and the time he is from, has 'fucked up big time' or something to that extent, and also explains that it's part of the reason he is staying in the present time.
So within the movies own premise, and through DIRECT dialog, specifically explaining every aspect of the plot and development of such, this whole thing makes perfect sense.
As last note. That we see before or after credits (can't remember), that Deadpool has the time-device fixed to pop more time-travel is without relevance to the scene in question. Cable at all times was only aware of the time-travel-device having 2 charges, and that's all we need to know.
Speculation. Since we are not presented with what kind of time-travel theory is applied to the movie, we can only speculate that maybe Cable had other reasons or fears going back to the future. This could be due to the butterfly effect, multiple time-line theory or many other paradoxes that could make it undesirable for Cable to travel back.
We can also speculate that Cable wasn't sure, but given no hint's or explanation, this is all speculation.
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