Husband has another phone?

So I was talking with my husband said good bye. But he never hung up! I stayed on the phone cuz I could just tell his behavior wasn’t right. Anyways he called his Mom he says from his work phone? But he told me he didn’t have a phone I thought in his office. Anyway he said he called her from work cuz people were calling his cellphone a lot? Well he never hung up with me! It just seems sneaky! And I’m thinking he is calling his exes sometimes by his behavior when he comes home and the way he treats us.