Confused

I know I wrote recently that I would not blog about my relationship with MFV but I am feeling so confused at the moment and obviously have nobody to talk to about this. He has been spending time with my sister, which, at first I thought was sweet and helpful. And I still want to believe that's all it is. But he's been helping her catproof her new condo and I'm starting to turn a bit green around the gills. He doesn't even like cats! But he took her to IKEA today to get something which would help the situation. I wasn't really clear what that was though. A dog, maybe??

I'm not close to my sister. We're too different. I've tried but I just can't have a meaningful conversation with her. He has tried to reassure me that he's attracted to me and therefore would not be attracted to her. She's the skinny, pretty one. I got the brains (and I like to think the personality!). There were a couple of evenings when he didn't text me back and it wasn't until we talked later that he told me what he was doing but not who he was with. He only told me when I asked who he went with. After that, I told him that I would be more comfortable if he told me ahead of time that he was going to hang out with her. Otherwise it feels as though he's hiding it and he said it wasn't a big deal. But something feels off this evening. Maybe I'm imagining things.

I guess, if it's going to happen (or if it has already happened), there's nothing I can do about it. But, if it does, there's no way around it. I will feel betrayed.