Jealousy is always hard to deal with because it's the result of insecurity - and this woman is playing on your insecurity because it feeds her own insecurity and calms her own jealousy.
This feeling will lessen with time - every day you spend with your husband is another day when he is with you, not her.
She will probably try to push your buttons because she knows she can, so rob her of that power. Always be nice if you see her, smile, and ask her how she is. Never mention your husband inless she does, in which case smile brightly, and say how happy you are, but don;t overdo it - she'll see you overcompensating, and take victory from it.
If anyone tells you that she broke your husband's heart, say "Maybe, but I certainly mended it for him, and he says it's better than ever now ....." and you can be sure that message will filter back to her.
Remember, smile if it kills you - it will kill her more, and hopefully this manipulative insecure woman will move out of your social orbit and allow you to be happy with the man you love, and make happy - when she couldn't.