In small villages gossip is endemic.
Her MIL will have been destroyed by being the subject of such gossip, affair and marital breakdown.
There is a generation of women that cannot bear to be the subject of gossip, mainly because they are such gossips themselves.
Small communities live off this type of thing, and NEVER forget.
I worked 35 years ago with a lovely girl (different department) from a farming background.
She got pregnant after a short relationship and confided in me that she was going for an abortion.
She wasn't telling her friends as she wanted it kept VERY quiet.
I insisted on going with her and our lovely male boss was so nice when I told him that I needed a day off suddenly without explanation.
I recall something she said that day as we discussed her choices "better that I come with cancer than a baby, such would be the upset and scandal in my family".
That was the reality years ago for many women giving up babies if they didn't have an abortion.
Particularly scandalous in small rural settings, but equally in an urban setting in those awful days.
Small village life might suit some, but to me it sounds utterly suffocating.
I can't imagine why the OP, having grown up in one, would want to be anywhere near such a scenario.
I imagine her own family probably were a bit 🙄 at her choice of notorious partner.
As others have written, they are judging him on his colourful past and the OP for getting involved with him, knowing dhat she knew.
There is a reason people move away from this type of setting.