I'm so torn 😖

I have a 14 month old boy who is my whole world. I love the idea of not sharing him or him having to share me, but at the same time it Makes me sad to think when my husband and I are gone he won't have anyone. Then again, having another baby just so my first isn't alone isn't right either, right? I know I'd love another baby just the same and I'd love to watch them bond (hopefully) but then I think about all the one on one time I'd be missing out on with my son. Deciding to have a second or not is way harder than the first. Am I alone in this? Thoughts?