Hypothetical circumstance

O.K. What would you think if you met someone and they were involved. But the catch is, that they are not really involved. They just have 20 years together, a child together but they do not sleep together. They simply just stick around because there is such a history with eachother. They are all they have ever known..... until you came along. You brought something so fresh and sweet into his life. You took away his boredom and you brought him back to life completely. He has fallen in love with you and spends almost every spare moment with you. He wants to end it with this other women whom he has spent 1/2 his life with. He always has wanted to end it with her but has never had a reason to until you happened. Now you are completely aware of the situation and you feel as though you do not want to be the reason they are breaking up... if they even do break up. You tell him at your kitchen table that you will not be #2 and that you are not pressuring him into doing anything but you do want him to choose. He tells you repeatedly that he wants to be with you. He wants it no other way. He just feels as though she really has done nothing wrong and he just wants to end it the right way. He continues to tell you that you are his future and she is his past. That you have him for the rest of his life and she will have him no longer. He wants you to completely understand what he is trying to tell you. He needs you to know how much you mean to him.... but yet he feels it may be going to fast. He wants you to realize that you are his choice but just not yet. Just not this moment. He needs more time. He needs more time to break away. Would you understand? Would you trust in him and believe that he is being sincere? Or would you think to yourself... Wait a minute here.. is he ever going to leave her? And if he does... is he always going to be looking for the fresh and new?