How can I tell my best friend that I made out with her twin brother and that I really like him? She shunned our last friend that did this.

At the school dance my best friends brother asked me to dance which somehow ended up in us making out like 6 different times. And since then we've gone on 2 breakfast dates and a lunch date. Chloe still doesn't know. The dance was a week ago and I've been too scared to tell her so I think I made it even worse.

Ive hungout with both Chloe and Jacob a few times since and its just awkward because she is completely clueless. I can tell he likes me and I really like him. But Chloe is going to be so mad.

How can I tell her without making it seem like I was trying to be secretive? And without making her want to ask Jacob about it because I can't completely tell if theres anything there or not and I don't want him to think I over analysed the whole thing.