Hi 48 - hope your Mum is okay, it does sound like she's being treated well - hope you and your family are ok too.
Dog - Tough one to call. He could be telling the complete truth, does he sound bitter about it? As a bloke I'd say from experience these things do happen, and there isn't much he can do about it. He could be being straight and open with you, and deserves the benefit of the doubt for being truthful. He could have just not mentioned it, and you'd go into it unaware of the issues.
However, it is a can of worms. I'd feel uncomfortable getting involved with someone in that situation, but people with baggage deserve love too, you know?
The other thing is - do you want to get involved with the kind of person who attracts people like that?
It's like - I'm a bit wary with women who say they've been physically abused in the past by partners - not because I blame them, just because there are likely to be trust issues which I don't deserve. If they're recovered and able to move on, then okay. If they'll flinch every time I offer to take their coat, that's something I'd rather not get involved with. No offence to them, I'd just rather meet someone who doesn't have those issues.
If this guy is lovely and sounds nice and sweet and a bit hurt but trying to deal with the experience, then go for it. If he's bitter and angry and feeling screwed over by women in general, then run away.