I think you know exactly what you got yourself into. 😕 And…I think that instead of asking me, you should ask her how many guys she’s slept with — because it’s obviously bothering you, and because of the circumstances, it’s a fair question. You may not be asking her because you don’t want to be disappointed by the answer, but I think you have to face the truth now because it’s bothering you so much.
In addition, ask her why she’s going after these guys now. There may be a good reason, and you may find that you want to help her — or you may find that she’s just really angry at herself for getting into this situation, and she’s taking out her anger on this search. 😳 Basically, you have to decide if you’re going to stay or go, and since you’ve been together for three years, I’m guessing that things have finally escalated to the point where you’re close to having had enough — or you put your head in the sand so you wouldn’t have to deal with this, for three years, and you can’t do that any more.
Relationships are about compatibility and they’re also about helping each other out through tough times, even when you disagree…. I’m not passing any judgment on your decision. But, this may be a moment where the two of you tackle an issue together and become closer as a result. Whenever you’re dating a single parent, things are more complicated than when you’re dating someone without kids, and if this also may be a moment when you realize you’d rather be with someone who has no kids. Either way, instead of seeing this as a headache, try to look at it as a learning opportunity. 🙂 Take a breath, and start the conversation.