Morning walk by myself

I don’t like to walk with my husband as I enjoy the solitude alone. He told me he feels like I don’t want to be around him and he’s sad and upset about that. I also choose not to drink that much anymore which has made me quieter on nights I don’t. I typically eat dinner, read or watch tv then early to bed as now I walk in the morning! I feel SO guilty to keep this going. He says I’m not the woman he married ( the fun drinker). I love him but feel smothered and guilty! Is this a boundary issue?