2nd phones

So my bf had a 2nd old phone and it showed up 3 weeks ago he never hid it from me was out in the open.. so i questioned him on it and he said he uses it for podcasts and the 2nd time it appeared it was buzzing i said oh what's that he said you know what it is... And he said that's all fb notefacations so yesterday he came home from work and he was on the 2nd phone for Twitter and i said oh why you using the 2nd phone for that you said you only use it for podcasts it's so weird to have a 2nd phone and he said why are you questioning me and i said oh am i not allowed so i said get that phone repaired so if you love ot that much.... So is he cheating why have a 2nd phone need advice