In a nutshell - left 8 week DD with DP on Saturday to go for a haircut. Was gone an hour and a half.
In that time, he took her round to his ex-girlfriend's house to meet her. He didn't mention to me he was going, didn't ask me whether I minded. (She's a friend of his, but I've only met her once, and that's only because I came home early from work to find her here as they'd been to a funeral together.) I called him when I got back and the pair of them weren't here, he dropped the call but actually pressed the answer button so I could hear he was talking to a woman. I thought he was in some cafe, didn't think any more of it so hung up.
When I finally got to speak to him on the phone, he told me where he was. I was angry that he hadn't asked me if I minded, but there was nothing I could do, so I dropped it. We haven't been getting on and I didn't want another row.
However, something else has come to light. I just noticed a porn site on the computer's drop down address bar, so, (rightly or wrongly, I don't care, flame me) I checked the history to find nothing, so looked in the cache. In the minutes after I left, before he went to his ex's house, he spent about 6 minutes looking at this porn site. From what I can remember, DD was awake when I left to go for my haircut. I don't care what he looks at when he is on his own, but I feel sick to my stomach to think he has been looking at porn while in sole charge of our new little DD.