THis is not a mutual friend---I only know Tom through my ex. Tom will be staying at my ex's apartment, and Tom invited me to play tennis.
Why are you considering meeting up with a friend of your ex? Since he is not a friend of yours, there is no reason you could not just politely decline.
I am not going to ask Tom if my ex is coming along, but it sounds like either triangulation or something? There is a chance I will see my ex during Tom's visit... .
If you do not want to see your ex, you do not have to explain your reasons to anyone. Even if you agree to meet the ex' friend, you are within your rights, and maintaining a healthy boundary, to say that you will be pleased to have a tennis game, but that you do not want to have any contact with your ex.
Why Tom is reaching out like this (when he's not my friend),
There is no way for anyone to speculate reasonably on what his reason may be to reach out to you. You could simply ask him before you agree to meet up, or say "no thanks, I'm pretty busy that week" and leave it at that.
and also, if I see my ex, I would not feel comfortable being civil or "neutral"---I wouldn't want my ex to think all is well between us (after he dumped me and left me high and dry out of the blue), yet I don't want to yell and cause a scene in front of Tom... .I am feeling nervous!
If you are not ready to meet your ex, then do not meet him and do not put yourself into a situation that will make you uncomfortable or set you back in your recovery from this relationship.
Here's a lesson on Healthy Boundaries that helped me:
https://bpdfamily.org/2010/12/do-you-have-healthy-boundaries.htmlDon't complicate things for yourself, shatra.
![Smiling (click to insert in post)](https://www.bpdfamily.com/message_board/Smileys/default/smiley-01.gif)
Think about what is good for you, keep it simple, and just do that. You do not owe explanations to anyone.
How does that sound?