First post here so deep breath...
DW and I have been married for over 10 years and have 2 DCs aged 3 and 8. Good marriage IMO except physical side has never been that great for either of us. Anyway, all well until after birth of DC #2:
A few months after DC # 2 was born, her mobile text alert bleeps. She happens to be out of the room, her phone is next to me so I glance at it and see on it quite a flirtatious text from someone whom we'll call 'John'. Curiousity piqued, I grab the phone and see two or three texts back and forth between DW and John which are also flirty. I feel sick and I confront her over this and it turns out that John is an old flame from before my time. I make it clear how hurt and upset I am and she promises she'll not do it again. I feel bad about snooping and make up my mind to trust her. She swears blind that there's nothing in it; as far as she's concerned it's just a bit of harmless fun.
Ok, so I forgive, forget and move on. Until about three months ago - exactly the same thing happens. More traffic between her and John on her phone, this time of a more sexual nature on both their parts, although the impression is that he's largely the one driving it forward. This time I really blow up at her, tell her how angry I am, how betrayed I feel and that I feel I can't trust her. Again, she swears that it is purely a bit of fun, that it;s just an 'outlet', she has her ego massaged by it and she would never dream of cheating on me with this mush. I 'punish' her by sleeping apart from her for several days but gradually forgive her...
But this time I don't forget; I feel I can no longer trust. I don't feel bad about snooping on her phone any more and, guess what, more texts last week between her and John, more explicit, again mainly driven by him although she is hardly fending him off. This time I haven't confronted her, as the last two occasions clearly achieved Sweet FA but really don't know what to do about it. I haven't been able to get to her phone this week but am sure this is continuing, as I'm sure that what I've seen are just the texts she hasn't deleted.
Right now, I feel absolutely devastated, betrayed, very hurt, very angry but also very scared. I want our marriage to work and am willing to consider Relate or something similar (but that would involve me 'fessing up to her that I know about the latest bunch of texts), and I don't want to lose her or our DCs, but I find the whole situation really intolerable. I still love her very much but find it really difficult to be around her right now (she's noticed I'm withdrawn ATM). I'm also really worried that this latest rack of texts I've seen seems to be an escalation and that she will end up having an affair with John. Feel sick constantly and can't sleep ATM.
I feel really conflicted right now. Part of me want to throw her out but I still love her and don't want to do that to our DCs. Part of me wonders whether this is just an escapist fantasy for her and not unfaithfulness from her POV(maybe the female version of blokes looking at porn?) and I should just put up with it (not sure I can though) and play happy families and pretend nothing's happening. Part of me wants to track John down and send him a photo of the DCs asking him what his intentions are to my DW and how I should tell the DCs that, or even go postal on him and beat the bastard up!
So wtf should I do???!!!