How do I even approach this?

Something felt off so I checked boyfriend's phone. In his texts messages were texts between a guy friend of his and my boyfriend. It was obvious that something sexual happened between them. My stomach and heart dropped when I saw my boyfriend's text about enjoying going down on each other and butt stuff. boyfriend and I moved in together a month ago and are supposed to be getting married. There was also Grindr app which is apparently a gay hookup app. Now this changes everything. My boyfriend presents himself as a conservative straight man who is "so in love with me" and because of having been cheated on in a past relationship, this hurts even worse. It turns out we have been living a lie. Why am I not enough? I love this man and am devastated. How do I even bring this up?

How do I even approach this?
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