UPDATE - Someone tell me what to do 😪

So my boyfriend has always talked bad about gay's , said if a guy ever touched him like that he would kill them . Well , I went on his phone to find the pictures he and I took together last week and I found a picture of his dick , with the grindr app water mark in the corner . grindr is a gay dating app . We've been together for almost year . He talks about how he wants a future with me and to start a family later on . But he's on a gay dating app . Someone just tell me what I need to do . Literally so confused . I don't know if I want to laugh or cry . lol I feel like a "beard" 😪. # UPDATE #- So I went on his email today . Found out he's been on Okcupid , Ashley Madison or what ever it's called , Craigslist and some other website I forget the name . I just confronted him about it , at first he got mad and walked out and said I was snooping . But I told him we are dating and I should be able to go on his phone and not find all that stupid shit . He came back and promised he would stop , he said he only did it because he was mad that I was on a website on there for only friends and he knew that , ( I had just moved here and I needed new friends ). I even let him go through my texts and non of them where from guys . but he still wanted to " get back at me " . So for now we are trying to trust each other again and will try to work this out but if happens again I'm out ✌ Thanks for all the good replies and advise ladies ❤