Yet another dilemma for Yota to be in.., What do I do? Options

[Yota]

My sister is a grade behind me (She's a senior in high school) and will be 18 later this month...

My buddy, Jesus, is my age (19) and goes to NIU (can you tell where this is going?)

Both of which are single...Jesus has been back home the last 2 weekends...

Last weekend, he was supposed to help me with my car..He called me and said he had plans...Turns out, he was with my sister out to eat. She told him not to tell me about it because I'd get mad (like it would make things better if I had to find out some other way...) So Jesus, feeling guilty for going behind my back, ditching me, and out with my sister, decides to tell me the real reasons why he couldn't hang out. Of course, I'm furious because I hate being ditched (Don't make plans if you're gonna break them hours before you're supposed to do something) He askes me not to tell my sister because she didn't want me to know in the first place.

After contemplating whether I should confront her or not, I decide not to. I don't know why I didn't.. My sister is one of my best friends. We don't hide anything from each other. I guess if she's going to be sneaky around me, I'm going to be sneaky around her. But I decide to ask my mom if she knew anything about the situation, because then I'd be even more pissed off about the situation. She didn't know anything and told me that I shouldn't worry about it because my sister isn't really looking for a boyfriend right now because she'll be going off to college next fall.

So this weekend rolls around, and once again, Jesus is supposed to hang out with me. He told me to call him after I get off work (i did and no pick answer). So my other, Erik, and I decide to go roll out in my Jeep Wrangler. It's approaching midnight, Erik and I are walking towards the Jeep and we see Jesus' S-10 driving down the neighborhood...Erik and I position ourselves so the Jeep is between us and Jesus' truck....He stops in the front of my house, and out of the truck comes my sister! Furious as all hell, I watch all of this unfold. Jesus turns around and takes off.

My sister still hasn't ever mentioned anything to me about the situation.

And all day today a couple of guys and I were working on my car and Jesus shows up... I ask him about his night last night and of course he tells me everything he did without mentioning being with my sister the entire time. I never got the chance to confront him about it because I didn't want to do it with the other guys there to witness...

Who do I confront first, my sister or Jesus?