A brother in the fraternity I'm pledging is dating my ex

[sialater]

I know I shouldn't care and it's none of my business what this guy does with his free time, but it's super uncomfortable for me. I didn't know about this until after I accepted my bid. We talked about it and he seems really cool, but he did warn me that I would probably see her a lot around the house (cause he would bring her over). I'm expecting the "get over it" responses but the situation is much more delicate than that so it would be really preferable if I didn't see her. We are not on speaking terms to say the least. I'm only a pledge and I don't want to give them a bad impression of me, but at the same time I really need to tell him that I would be really uncomfortable with him bringing her over all the time. I don't see what the big deal is, the events are only for 2-3 hours, and he can see his gf right afterward. But he seems pretty insistent on bringing her over.

Is there anyway I can confront this?