I have benn with my boyfriend for two years we have two kids, house and everything we need but the love and attraction.For some reason its gone .I went out one night and saw my ex eventually after seeing him for alittle bit I decided to start sleeping with him

I should have never done that now I think I have a minor std but I dont know what to tell my man, how do I explain this to him, if he has it they have to tell him and treat him.He'll be heart broken I dont know what to do.