Most often they’re not ready for one person as they enjoy dating others. Or they don’t want to devote time or energy to one person due to other reasons. It’s not an excuse, it’s the reason they feel they don’t want to commit. The more you try to pin a guy down, the farther he will run because it’s the man’s job to ask the lady to be in a relationship. If you’re the one who asked him for commitment, you seemed desperate and less desirable in his opinion. Date someone who in time would be willing to be a good boyfriend.