Substitute

-You see, in the end I didn't replace you, unlike you who replaced me. 
- True, but you make it sound like it was so easy. Like I enjoyed doing so. Replacing you took effort and courage. 
- So would it have taken not to replace me. 
- Dear, don't forget that you too were a replacement for someone else, just like I probably was for someone you knew. We use each other until we cannot. You're as important to me as the one before you was and the next one will be. 
- You make it sound so cold, do you even care about how I feel? 
- Sweetheart, the love you know lies only within your body. The flesh knows only boundaries. It's safe. Once you lose the fear of what lies beyond, you'll understand why you can be replaced. 
- Does that mean that you think that you cannot be replaced? 
- All it means is, that I love you.