Fun Coop games to play casually with my SO?

BattleBlock Theater

Stardew Valley works really well.

The Borderlands series is probably the most time I've spend in online co-op, and a complete blast.

Divinity Original Sin is great if you want to play a co-op RPG.

Gears of War is great in co-op.

The Division is a lot of fun.

The Secret World is really nice as a f2p co-op MMO.

Cook Serve Delicious 1 or 2? What about Human Fall Flat?
BTW this forum is for "Bugs / Suggestions" for this site, not for you to ask for game suggestions ;) So you might want to edit your post and change the category to General or Off-Topic

Any of the Borderlands games. Seriously awesome games, you'll have a great time.

Steep on uplay it is free now !!!
Pay day 1
CS: GO
Left 4 dead 2
Chivalry
GTA 5
Diablo 3 (or any similar game)
Starcraft 2
League of Legends or Heroes of the Storm

These are my TOP games, that I play with friends

I would recommend both the Borderlands and Saints Row series.

Im going to say Deep Rock Galactic https://store.steampowered.com/app/548430/Deep_Rock_Galactic/
Great fun game about mining and shooting bugs.

What genre of games do you know she likes or doesn't like? What about build quality? Indy games ok?

Orcs Must Die 2
Human Fall Flat
Portal 2
Killing Floor 2 (or even 1)
Lara Croft and the Guardian of Light (and The Temple of Osiris)
Rampage Knights
Titan Quest
Heroes of Might & Magic series (especially 3)
Trine series
Worms series
Mortal Kombat series

Dont Starve Together. Updated recently and releasing new content at 0 additional cost, currently new content under beta. Overwhelming Positive, Loads of mods, to cater to your playing needs. Low price of $15, also if I am not mistaken, you buy 1 copy and receive another in your inventory, I am pretty sure that policy still exist. One of the nicest indie company that exist in the industry. Have fun! ^_^

if you like to blow stuff up killing floor 2 is imho the most fun you can have when playing co-op / pve.

Have a look through this and maybe you find something interesting
https://www.co-optimus.com/

Shovel Knight: Treasure Trove

F.E.A.R 3 was fun for me and my friend.

Battleblock Theater
Vermintide
7 Days to Die
Borderlands
Contagion
Divinity Original Sin
Don't Starve Together
Keep Talking And Nobody Explodes (amazing coop/couch game)
Killing Floor 2 (currently on sale)
Portal 2
Spelunky
Stardew Valley
Terraria
Warframe

1. Divinity Original Sin
2. Divinity Original Sin
3. Divinity Original Sin

Ibb & Obb

My gf doesn't play at all, so if she joins me we're usually playing really simple games. Like Ibb & Obb or Trine series.

She also loves Tricky Towers, it's a tetris clone with physics where you play against each other.

try the division its amazing i am playing it with my girl friend since 2017

Depends on what kind of games you both like. Below are some of the ones that I've played with others.

Armello Currently on sale on Humble Bundle store.
A friend gifted this game to me and I've played several games with them since. It's a lot of fun. It's basically a board game with the objective to become king. Each game lasts about 1 hour.

Civilisation
Any of the Civ games are pretty good to play with others because again, each game lasts about an hour or so. I had taken more of a liking to Civ IV: Beyond the Sword.

Terraria A friend gifted me a copy on Steam which I haven't played yet. Had it for Xbox though and liked it a lot.

Worms Franchise Silly games, but a hell of a lot of fun. lol. (Naming the worms can be pretty hilarious too when you have a few playing).

Try to play together a way out, its a must for anyone who is looking for a coop game with a great story and a lot of variety on the missions.

Broforce dude.

All the Lego games are a blast to play co-op, especially if she doesn't play much.
The Cave is also a pretty fun and hilarious platformer for co-op