If you are looking for a new job for ANY reason, do not share it with anyone you work with. Word will spread quickly and eventually get to your boss.
I made this mistake and my supervisor found out . We scheduled a meeting and asked why I was looking for new work. I explained to her it was for financial reasons and nothing personal. This was a lie. I was actually passed on for a promotion.
I found a new job and will be starting in a few weeks. Now I am getting a lot more work than I am used to and my coworkers are staring to resent me because they know once I leave they will have to split my workload until they find a replacement.
Coworkers organizing a trip to the movies or meet for drinks/apps after work? Do it. Mom of your kid’s friend invites you to a paint party they are hosting? Do it. Neighbor you don’t know well invites you to stop by a bbq they are having? Do it. If you take people up on offers no matter how small or maybe not exactly what you are interested in, you’ll start meeting more and more people through these activities. They often snowball and you’ll find yourself being invited to more and more.