Realizing a trigger

Advice/feedback is appreciated. This is in reference to my SO: Making plans with other people and then saying: “i definitely want you to come” ... like it’s an option for you to go without me if I don’t? and then i try to push away and say “idk if i can” cause i’m a bit pissed off (for no reason i know this illness makes no sense) then says it wouldn’t be the same without me. Like, no. You’re not going unless I do. I hate being controlling and feel like this is a form of abandonment. Afraid he’s gonna go on this camping trip and cheat on me if i’m not able to go. This is the first time i’m realizing a trigger, honestly. If I didn’t stop and ask myself why I feel upset I would’ve let it fester and moped all day then keep it in my back pocket to pull out when during an argument or fuel a depression manic episode later. Proud of myself for realizing this, but it still doesn’t make me feel any less pissed off.