I do a lot alone in my everyday life; DBF and I are together a lot (we even work at the same place), but we're not that couple who needs EVERY MINUTE together so we often do our own thing too.
That being said, I did a partially solo trip in October (my mom met me down there), and then did a totally solo trip in January, and now I'm very much looking forward to my second, longer solo trip upcoming in September! I wasn't lonely at all - I enjoyed having the big bed to myself and doing what I wanted when I wanted it. DBF enjoyed having time to do whatever he wanted back at home, too. I ended up hurting my legs pretty bad from going full-out in the parks, and even alone at first aid with an ice pack on my legs I was ok with being alone.
Everyone is super friendly, every place is pretty darn safe, transportation can't be beat, and you never feel alone - you're just surrounded by 1000's of friends.

I had someone to chat with in every line, and when I didn't, I was on my phone sending pics or updating social media, or just reading and planning.
This time, I'm hoping to stay at BCV and spend a day lounging at Stormalong Bay, hopefully with a drink in my hand! Aaaah, can't wait!