Dating/Friendships

Throuple experience or something?

So like my partner and I are thinking about trying to casually add someone to our relationship, like a FWB I think?
I'm very shy about this, and I have major trust issues from a prior experience with a third. I say this because I feel like I come off as... Abrasive? But I promise I'm just a shy person who's been hurting inside lol.
Here's a little about us (nicknames used for right now)
We like anime, I like horror movies, he likes videos games.
Pidge (me) (she/they) female, feeder, switch sub, likes gardening and animals, short, shy, low drive (fuck antidepressants)
Arie (he/him) male, feedee, switch dom, speaks 3 and a half languages, tall, not shy, high drive,
Feel free to PM? I can set up a group texting chat on discord or something? Thanks for checking us out.
Edit:
Forgot to add, I'm pansexual and he's curious but mostly straight
1 year