Cause??

I’m probably gonna get some bloodwork done soon but suddenly I started getting cold sores around my period again. Coincidentally I started flaring up when my friend of many years was becoming stressful. When we broke up and stopped talking the flare ups went away. We tried reconnecting and ended up arguing, the next day I had a flare up. Today we met, things went well, and Im dealing with a possible flare up. Is it literally just the stress of seeing them atp? I have to communicate that there’s real hurt behind our situation and I know stress can be a trigger… we also hugged and then immediately after I felt it get itchy and I could literally see it pulsing red in the mirror 😭🥀 like is my body fr rejecting this person yall? Has anyone else experienced this with someone??