Me and my partner have always been close. We been together for 1 year but known each other longer. Recently he has started to be more secretive, not leaving his phone on the side and spending more time out than he does with me. In the last two 4 months it's as if he has put up a wall between us. I've tried giving him space and reaching out to him but nothing works. I'm not sure what to do. I don't know what he is trying to do as he won't talk to me. Does anyone have any theories? All welcome.