When do I use the simple past of 'end up'? (end up vs. ended up)

[Meggie]

Hi Allan,

Thanks your explaination very much!

[Kati Svaby]

Hello,

4. and 5. answers are not good here, because there are end up and finish up phrasal verbs. So we have to imagine their meaning.

finish(up) with sth = to have sth at the end. (up is in parentheses and there isn't with and the meaning of the phrasal verb is suspicious.
-We had a five-course lunch and we finished up with coffee.
-To finish with, we'll listen to a few songs.

So finish (up) is questionable.

But: end up = to find yourself in a plane or situation that you did not intend or expect to be in.(this explanation fits the example-sentence)

1.end up doing sth= here: ended up paying
2.end up+adv/prep = If you go on like this you'll end up in prison.
3.end+adj= If he carries a driving like that, he'll end up dead.
So the first is fitted:
He thought they would all share the cost of the meal but unfortunately ended up paying for everybody.

We have to know the meaning of the phrasal verbs.
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We always deceive ourselves twice about the people we love - first to their advantage, then to their disadvantage.