Until a couple of weeks ago my 21 mo ds & I were best pals. Me & dad both work shifts and ds had equal time with both of us. Now ( for no apparent reason ) he gets absolutely distraught if Dad tries to leave the room or goes out etc etc and wont come to me. He regularly rejects me if all 3 of us are together but is fine when dad is not there. The rejection is breaking my heart. I am crying like a baby as I type this as it hurts like nothing I have ever experienced before. I have asked Dad to go out all day tomorrow as I can't bear to see them playing and laughing together whilst I am excluded and being rejected by ds. Whats going on ???