follow your gut feeling all the things you have described almost certainly points out that he is using again. its heart breaking and i feel your pain. the reason he is angry when you confront him is because you are right with what you are saying and he does’nt want to admit it to hiself. have you noticed money going missing or anything like that because again another sign. it is hard being in love with a addict but you have to think of yourself and your children. Please go with your gut feeling you also have the evidence my partner hid his foil in his socks bit stupid when it was me who did the washing. they do become very secretive and go missing i also found this with my partner. please look after yourself addicts are selfish and have a real way of making you feel guilty for suspecting what is true.