It's been a while, but I'm looking for another manga. x)
So I'm looking for a manga where the old lover, or "flame" comes back. It could be either of these scenarios:

old lover comes back after long absence:
a.) and main character and ex get together again in the end.
OR
b.) but main character already has a different lover and main character chooses his current lover.

This is a bit confusing...to explain a bit more:
For scenario A, the old lover CAN be either the main character or just the main character's partner.
For scenario B, the old lover can just be a side character to throw in as one of the couple's obstacles to overcome.

*By old lover, I don't mean age. I just mean an ex-lover.

*And if there's already a thread for this, I obviously FAILED at finding it, so if you could link, that would be great!
I don't mind whatever you suggest, just no guro.
Thank you for all the suggestions/help!

like ... hot gimmick maybe?
I never finished it but if I remember it well, it fits one of your two scenarios
can't think of anything else at the moment...

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"Fools" Said I, "you do not know,
silence like a cancer grows"

For your second choice, i'd suggest Honeymoon Salad.

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"Si camino no hablar..."