<human>: Hey, /r/relationships. Throwaway because boyfriend knows the username.

So, like the title says, my long-term boyfriend has a Plenty Of Fish profile. I found it while scrolling through the apps on his phone to find his Reddit app while my phone was dead. I couldn't help but click on it. I don't like to be nosy, but I mostly just wanted to check to see if it was active or he was actively using it. I will admit, we have split up before (started dating in high school; people change a lot and it was hard for us there for awhile), so I just assumed he made it during our little three or four month break, and I wasn't angry about it... at first.

He sent a few messages to a few different girls less than two weeks ago. We got back together three months ago. 

I don't know how to go about this. I have a tough time confronting people when I'm angry without taking everything super personally, and he has a hard time explaining himself when being confronted (which is one reason we split up before), but we're supposed to be working on that. I'm doing all I can to not storm into my bedroom and push him off the bed. I've decided to be an adult and let it rest until morning.

So, Reddit. What do I do? How do I go about this? I don't know how to start a conversation like this. I don't really even know what I'm asking for. I just need some help, mostly to help me calm down, I guess, and collect my thoughts. Thanks for reading.

Provide a brief overview of the text.
<bot>: Found out my boyfriend of five years has a Plenty of Fish profile and has been trying to contact girls on the site. Help!