Feeling Stuck and Alone: How Do I Make Friends?

How did I end up here? How do I fix it?  I was cyber schooled in high school with my best friend. We had a falling out in 10th or 11th grade. 2 years post graduation is when I met my fiancee I was nearly 21 he was 26. Not even 1 year later he got diagnosed with ESRD, AKA kidney failure. Fast forward to now, transplant appointments, our own place but I feel stuck. I have no friends other than him.  I haven't had real friends in 7 years! I don't know how to make friends. Even when I try I forget to respond to messages and feel awful. I just feel alone.  7 damn years. 🤦‍♀️ *Just to clarify, I love my fiancee dearly. I don't feel it's fair for me to expect him to fill every social need I have. I just don't know how to be a normal adult in regards to socialization.