Dating: The ups are super fun, but I miss the security of a full on real relationship with a committed partner (not that my ex wife was an ideal partner by any stretch). I miss splitting the bills with someone (even if the split was 25/75) and having someone who has been around long enough to sort of understand what I do for a living.
Constantly being at the stage where I can't make any mistakes and I can't expect anything more than superficial support is draining.
Also, dating a mom is weird. It's fun cause she has a ton of pent up sexual energy whenever we meet, but, fuck, it'd be nice to just have a night to chill and not have to perform (but I'd feel guilty and like I was letting her down if a good portion of time together wasn't based on making out).