But would it feel shit if you weren't already feeling shit about yourself?
I've been a last minute invite to lots of things, because I've bumped into them in the street or text to say do you fancy a pint and they've replied "Actually, we're having a party next week, why don't you come?"
Yeah, I wasn't their first thought, but they still wanted me there in the end, so how is that a bad thing?
There could be any number of reasons for why you weren't invited. Maybe they forgot about you, maybe they've gotten used to not inviting you because your husband is a twat, and they've just realised that they can invite you now without him. Maybe they thought you won't enjoy it because it's mostly couples, and now they've changed their mind. The ONLY thing you know from this invitation is that they'd like you to be there.
And they're not asking for you to be there because they want to hear about your new extension or your holidays. No-one actually enjoys hearing about that crap because it's dull and boring and its just time filler before you all get a bit tipsy and start talking about absolute bollocks instead.
So if you want to see these people, then go, and if you can't be arsed then don't. But if you've been invited at all, it's because people want to see you.