Can someone please talk me out of confronting my boyfriend (serious answers please, see details)

I know I’m going to get a LOT of crap for this, but please hear me out.

Without going into too much history, my boyfriend and his ex are still on speaking terms and share a dog. They dated for 10 years, starting in high school. She cheated on him while he went away to school, and according to him, she treated him like shit.

Whenever she breaks up or fights with her current boyfriend (it’s at the point where I have no idea what their status is now because she deactivated her Facebook and I can no longer stalk her profile :x), she ALWAYS initiates more contact with him when she’s fighting with the current boyfriend and baits MY boyfriend (her ex) by dropping hints that she broke up with him, etc.

ANYWAY, so when he and I first started dating, her “presence” in his life was a major, major hurdle for me to overcome. For the most part, I think I’ve gotten over it but it still bothers me (naturally) that they keep in touch. I am most insecure when she is “on the prowl”, so-to-speak, because she never has good intentions and I know she doesn’t really love him anymore but just uses him as a fall-back or whatever when she breaks up or fights with her boyfriend. It’s really messed up. But the kind of person he is, he’s never going to just be like “hey get out of my life”.

So cut to this week, and here is where you’re going to start yelling at me—(but please try to be gentle, I know I was asking for trouble when I did this)—I read his texts. And I found a drunk text from her (the ex) to him a couple weekends ago. It said, “Hey hey, can I come over?” WHAT THE FUCK! But that’s not the worst part. He drunk-texted her back, saying, “Where are you? Bring [the dog’s name]!”

They didn’t meet up, thank God, but I really shudder to think about what would have happened if they did. Drunk girl + drunk guy + 2am does NOT a good situation make!

Now, I know some of you might say “Well OBVIOUSLY he’s cheating or he’s a rat-bastard or he’s an idiot, leave him” but the thing is, and I do NOT say this naively, he has NEVER done anything with anyone else while we’ve been dating. He does speak to his ex on occasion, and might hang out with her like once a year just bringing their dog to the pet shop. He’s just simply not the kind of guy who sleeps around or brings girls home or calls his ex because he’s not over her or has booty calls. But when Cruella deVille knocks and tries to take advantage of him, I’m really worried that something might happen because she’s such a conniving selfish evil bitch who just wants to keep him wrapped around her finger while she’s out looking for someone else or trying to work things out with her boyfriend.

Should I confront him? What should I do? If something DID happen (which I’m about 99.999999% positive it did NOT), what would you do? Forgive? I should mention that I’m going to be slightly conniving myself if I do decide to confront him, because I’m going to make sure we’re both good and totally plastered drunk first before that happens. Don’t judge me…the way our personalities are, it works better this way.