No, not her fault, but she was happy to cheat with him when he was with Lisa. I can't imagine Lisa Moorish felt she owed Patsy anything.
But ultimately it's all Liams fault. It doesn't really matter how well any of these women behaved, it's LG who was failing to keep it in his trousers.
Erm. I don't think you get it. Patsy was MARRIED to Liam when he screwed Lisa.