This is common and happens frequently, but some couples don't care. I understand why the woman ended the relationship, as it's better to end it before it gets too serious. However, there's no harm in giving her a warning, and if she persists, it's a sign she's not serious about her partner, and she has the right to make the right decision.
I mean, gambling has always been viewed negatively, and it will have negative consequences if it continues. And like many other cases, families or marriages have been destroyed because of gambling, and domestic violence has even resulted in loss of life, among many other cases, and we must acknowledge that. So, partners, families, or children are victims of irresponsible or addicted gamblers in many ways.