If you are single people, you have time for yourself. Being single allows you to focus on yourself, without the distraction of another person. You can train for a marathon, take up a new hobby, or focus on growing your career. You can do what you want, when you want. If you want to stay out late and eat dinner at midnight, then you can. But people in a relationship don’t have it. Any relationship requires time, energy, and a level of devotion to function properly. Being in a relationship is all about compromise, but when you’re single no compromise is needed.
You don’t have to force relationships. When you’re dating someone, you get involved in all sorts of forced relationships. You have to spend time with their friends (who you may and may not like), you have to deal with their family, and you may even be expected to build relationships with their pets, co-workers, and exes. Not only does being in a relationship with someone you love take time and energy, but the amount of your life that you have to give to people who you may not even like can be overwhelming.