Me and my girlfriend have been together for a long time, just shy of a decade. Long story short, I'm into the cheating thing. Not the full on black bull stuff but the whole idea of the slut thing is appealing. So it ended up happening, an off thing and I completely did not anticipate my reaction. I thought yeah I like this, but I was filled with this unbelievable rage. I'm not a massively angry guy but I think this is probably the most natural reaction to have. Now I'm not totally sick to my stomach, honestly the act itself or the fact it happened doesn't bother me massively. Seriously, I invited it, even had sex after and felt a bit better about the whole thing but the rage is still there. Now, I don't blame her at all, I didn't even get angry at her because I straight up said yeah that shit is fine. In fact, could even say I encouraged it. Not specifically this time but generally speaking. I think what pisses me off, the real problem I have with this, is that firstly this guy didn't and still has no clue I'm into this, he just done it. And also because this guy befriended us both recently and it was that sort of slimey way, guy serially bragged about cheating on his girlfriend to her and all this stuff. Sort of the whole persona of him towards us both was an act and the guy probably planned this shit from the get go. Not saying that in some crazy conspiracy sense but the guy is just a slimey fucker. And that's where it hits home, I keep imagining his face smug and accomplished, while I'm sitting here feeling like an idiot. And while I invited this, definitely, I can't help but be particularly angry about that aspect of it. So far I've thought let's just leave it, life is going well for me right now and don't need any police trouble if he's the kinda guy to go to one. Another voice in my head is saying "Are you just going to take that?" but then again I sort of let my girlfriend kind of do that? Aside from violence, I've also toyed with the idea of messaging his long-term girlfriend and fucking him over that way. I think I'm just really confused now as to what it is I'm meant to do now. Obviously in any rational situation, the relationship would be in bits, I'd have already been out looking for him, all this. But if I sort of implied, at least on her part, that I liked it, do I have any right?