He's disappearing now.What should I do? My boyfriend and I have been together about half a year ; at first he was sweet and thoughtful and never let me wait late but as time goes by he's changed.He started to ignore my call and barely replied my messages;generally speaking I could hardly find he when I need him.I couldn't reach to him for over a week and this situation happens a lot recently.Whatsmore;I found a girl calling him in the morning and he just hung up the phone in front of me but he was sending her messages when he was having lunch ;I saw the chatting records on his phone and it's obviously they were flirting but he explained that they were just joking.;and now I don't know where he is and what he is doing ;he didn't pick up the phone.It's like I'm nobody to him and I'm invisible to him.He only show up when he wants me but he didn't be there for me when I needed him.I feel like I'm betraied and left in the dark alone.What should I do?