In the Middle Ages people believed that the earth was flat, for which they had at least the evidence of their senses: we believe it to be round, not because as many as 1 percent of us could give the physical reasons for so quaint a belief, but because modern science has convinced us that nothing that is obvious is true, and that everything that is magical, improbable, extraordinary, gigantic, microscopic, heartless, or outrageous is scientific.
Fear of being alone is not a good reason to stay. Leaving this man you’ve been with for six years won’t be easy, but you’ll be okay and so will he. The end of your relationship with him will likely also mark the end of an era of your life. In moving into this next era there are going to be things you lose and things you gain. Trust yourself.