And this is exactly what I am trying to get you to focus on. Why are you letting 3 little words get in your head so bad? It will only serve YOU to work on that.

And I will tell you, if my boyfriend was so easily manipulated and let his ex get in his head so much by a "I miss you" text, which may have not even been intended for him (I know you say it is, but it's not something she is admitting to) I would be really concerned about where his mind and heart is. I know you say Mary is great and understanding, but if you want to take this R further, your ex can't have that much control over you anymore.