I'm absolutely gutted. I found out by seeing some texts between them, and more has gradually come out over the three weeks since then. He is of course claiming it was just sex - but 3 years?!
He's finished it with her now and is saying that me and our one dc are the most important things in his life. I do love him, we've been together since we were 18, and I suppose I am at fault too in that I let the physical side of things slip, would spend most of each evening upstairs while he was downstairs, and have been quite an angry (not physically) type. I don't know what to do or what to believe or how to act.