My Fiancee dropped a huge bomb on me💯

So me and my fiancee had a fight about him being dishonest with me😢 (He told me he wanted to try to have a baby 3 months ago, now he tells me that he doesn't want to try anymore.) I go to the bedroom and leave him in the living room. After a little bit he came in there and said we needed to talk😬 He told me it scares him having a kid because if he can't be honest with himself how can he expect the child to be honest with themselves or us. I gave him a look of confusion. He looks me in the eyes and tells me he is bisexual🌈 (I don't have a problem with gay people or anything. I my self wouldn't mind to try anything with a female, but I'm not bisexual per say.) We've been on and off for 5 years and we live together now. I think he should've told me sooner. Opinions? Anything can help right now. Please nothing rude towards him💯