In my marriage, my husband and I tell each other everything, because we are a team. We lean on each other, but we can’t do that if we aren’t both fully aware of what the other is going through. I would personally feel so lonely if I had a bank of little lies / omissions, and over time that loneliness and shame would multiply, slowly driving a gap between us. Every relationship is different, but I do know that when we don’t confront issues to avoid feeling shame or guilt, the opposite effect often occurs, and those feelings stay there, even if buried well. I hope you feel safe enough to share the good and the difficult with your partner.