yes, my family, too, my close relative married a man she met during a holiday abroad, very quick, whirlwind romance, they returned to the UK together after some time in his home country (he had a job there and wanted to work till end of contract, plus immigration etc., my relative is self-employed and works mainly on line, so she was fine to stay there)
stayed here for some years, had a baby, then relationship got a bit rocky, finally, they had a very serious row, he stormed out and decided he'd go back to his home country.
When my relative tried to contact him there to reconcile, it emerged, through one of his sisters who spilled the beans, that he had actually returned to his partner and children (two of them we think) that my relative knew nothing about!
We believe he had never broken up with her, but invented a job abroad, he travelled back regularly, but there was always a reason why my relative could not go, he did use to send money back home regularly, too, but my relative thought it was to his mum and siblings!
Now they have no contact and relative's child never even mentions him anymore (child was primary school age when he went off, so she remembers him!), nor has she ever met her half-siblings, very sad.