Husband maybe cheating


So come to found out that my husband has been talking to his ex girlfriend. He got on me for talking to my ex boyfriend. Know he told someone we knew that him and his ex girlfriend are just friends. I don't know what to believe anymore. I dont know if his going to leave me with two boys and be with her. And I really dont want to talk to him about it because then he said I was invading his privacy in his phone. So I dont know what to do.