Does this mean he likes me? How do I let him know? (Mormon missionary)

Okay, a bit of background. In bullet form point:
-I started investigating the LDS church in April, was baptised in May and have been a very active member ever since, helping the missionaries several times a week with teaching other members/investigators.
-The missionary that I have a crush on (let's call him Mitchel) knows I'm gay but doesn't know I like him. I've known him since the very beginning, back in April
-Ignoring the fact that he's a missionary for the moment, he does a lot of things that would usually mean that the guy likes you:
-He acts shy around me sometimes, yet other times acts super friendly
-He laughs at my jokes even though they're never that funny
-He remembers every small thing about me, even if I only told him the thing once several months ago
-Whenever I see a good-looking guy when me and the missionaries are somewhere (eg Starbucks) and I watch as that guy walks past, Mitchel always looks to see who I'm looking at
-During church last Sunday, we were all out in the corridor. I got a random b*ner (these things happen, especially since I haven't masturbated since April, because the church forbids it) I went away from everyone else so that no one would notice but before I had time for it to disappear, Mitchel came over and started talking to me. Guys don't usually talk to other guys when they have randoms: he's a guy too so he should know that I wanted no one to see me while I had this dilemma. He started talking to me, and stood extremely close to me (way closer than a guy would usually stand to their friends), he told me that I shouldn't "lie to myself", that I shouldn't have to find a girlfriend (even though other church members had said that that was a commandment) and then he walked away when he saw that another church member was going over to where we were. After that, he didn't talk to me for the rest of the day.
-When we're sitting together, he always mirrors my foot movements. Sometimes he does this quite noticeably: lifting one of his feet in the air before putting it down again
So maybe he might like me, maybe he doesn't.
But the thing is, this weekend I'm meant to be playing volleyball with the church (today) and going to church itself (Sunday). However, because I'm pretty upset and confused about my feelings for this guy, I think it's best if I spend a weekend away from church stuff.
He'll probably ring to check up on me, to ask me why I didn't attend church/volleyball. How can I possibly tell him the reason for my absence without lying? How do I tell him that I like him, without creeping him out?
Also, why would he sometimes act very shy around me, and act like I don't even exist, but then other times he acts super friendly around me? I'm pretty good at reading people, but he's the only person who's ever acted like that. Am I correct in saying that that might be a sign he likes me??

QUESTIONS:
1. Why does he ignore me sometimes and act super-friendly other times?
2. Why did he talk to me when I had a b*ner, when he knows (being a guy himself) that I wanted no one to see me during an embarassing moment like that?
3. From the behaviour I described, does it sound like he likes me or am I reading too much into it?
4. If he does like me, how do I let him know?

And yes, I realise that-if we both like each other-our faith could prevent the relationship from happening. I'd be happy with a friendship - we both know that we like one another but we choose not to act on it - and all I really want to know right now is how to open up to him, so that I can get this off my chest. Keeping it secret means that I always feel uncomfortable around him, like I'm being dishonest or something.