I appreciate your brief letter but doubt you will hear what I have to say or that you will adhere to what I suggest. You will avoid much future pain if you take to heart what I have suggested. But, love (or what feels like love) IS blind. It is also deaf, and mute. Therefore my comment is made with the understanding that you will probably not agree with me, hear what I am telling you, or speak up for yourself. Also, you give no indication of your degree of involvement, or if he is married, or if he even knows you. Please take time to send more information.
A twenty-six year age difference would be somewhat understandable if you met this man when you were already in your forties or fifties and each of you had lost a spouse. While you are yet a child, this relationship offers you nothing good or worth having. In the presence of a witness, sever all ties and run in the other direction. A man who is more than twice your age and who displays romantic interest in you is a man without integrity.