Looking back from the vantage point of 70+ years of life, and having seen many people experience this very thing, I think the key is to get to know yourself. That sounds cliche, I know. Up until now, you have defined yourself in terms of your relationships with other people: your family, your partner, your spouse, your work group, etc. Many of the folks I've known had never been on their own, never done their own laundry, cooked their own meals, and so on. When divorce hit, they were devastated. And socially set adrift. In a few cases, they responded by hooking up with the first person that gave them the time of day, which proved to be less than optimal. The more successful of those transitioning to being alone worked on learning who they were, what interested them, how to do the routine things that perhaps someone else did for them in the past, and so forth. One person I knew experienced this in their 40s. He prepared his first meal for himself at 46. After stumbling around a bit, he decided to throw himself into cooking, discovered that he loved it, and went to school to become a professional chef, giving up software development for cooking, less money but far happier. When we search for hobbies and connections, far too often we look where we've always been. For those of us in some computer related field, it may be programming, video games, and other tangential "hobbies". When we branch out, e.g., learn a musical instrument, take dancing or singing classes (great way to meet people), take up public speaking (Toastmasters), find a good gym, or any other pursuits, we discover things we never knew we loved and people from outside our usual social circles which up until then had been dominated by work relationships. Suddenly, one is no longer alone and forms friendships based on shared interests and mutual connection. Those friendships are more durable than most of the relationships one forms at work. And in the process, one may find a new romantic interest, or several. Bottom line, break out of your comfort zone, and try something new. And if you find that exceedingly difficult or even debilitating, perhaps seeking the help of a professional would be beneficial. No, none of this is easy, but it is a great opportunity to discover yourself, other people, and to enrich your life experience dramatically. Good luck.