I agree with Snodderly. There are sites more geared toward "friendships" - such as maybe meetup? You can join a group that shares your interests and it doesn't give off the same vibe as posting on a dating site.
Or maybe you could join a local gym or club (idk, reading, french poodles, what ever floats your boat).
Like AJM said, detach and focus on good-for-sam stuff. Because you have an interest in reuniting with your wife prob best to, for now, explore non-relationship areas.
Approach the mediator with an open mind, as a fact finding expedition. You will have a better idea where you stand legally - and knowledge is power.
Best of luck.
Me 46 H 56 M 22 yrs S22, D20, Twin Ss18
You teach people how to treat you by what you allow. What you stop. And what you reinforce. ~~~~~~~ A lack of boundaries invites a lack of respect.