My boyfriend and I have been together for 3 years . His friend is always “backing him up” on everything he dose wrong . Like this is not any of his friends business. My cousin sent me a picture of a Facebook of his that I never even knew about ? We are very open with our social media ? We share Instagram for goodness sake😔 I honestly feel like he’s cheating on me ... there have been many other signs . I’m thinking maybe he is using one of his old phones to talk to other girls ...

HELP!