My girlfriend of 7 years has been cheating on me and I’ve just found out by going through her phone. I found out by looking at a conversation with her and her mum and her mum knew about this right from the start. We have a 4 year old son and live together at home. Whilst my son has been with his grandparents I have been out with friends and she’s been doing the same (well at least that’s what I thought). She’s been sleeping with someone 22 years older than her and I dont know what to do. I love her and I know that this isn’t the person I fell in love with. I feel at fault as I’ve been out with friends and also been home with our son while she’s been working until 10pm (she has been at work as I’ve called the store telephone and she’s answered everytime). She says the reason why she did it was because I haven’t been showing or paying attention to her so she got that attention from somewhere else. I feel at fault even though I’m not. I’m stuck and need help/advice.