Is AUTHOR wrong in the post ? POST : please forgive my lack of grammar skills

a bit of background: I recently met a classmate and we hit it off really well and we are kind of friends.

recently: they decided they wanted to take a class with me and I was fine with it and didn't think much of it honestly. well, after the first class they tell me they are going on a "research trip" for a while and would be missing class for a while and the professor said they were on their own. when they told me what the professor said I basically said well you'll have to learn all of that on your own then (I am a bit of an asshole when it comes to prioritizing school). I did feel a bit bad and told them I would be up for studying the material they missed and offering clarification if they didn't understand a concept or two, given it was just studying. I clearly told them I couldn't teach them what they missed.

well, they don't prioritize school and decide to not even look at what we are learning during the time they were gone and they expect me to essentially teach them. I understand having to go and do research to further our academic careers and to keep our resumes looking good and feel, again, a bit bad for them. when I asked them about their trip all they said was it was fun and really liked where they went but, later on they let it slip that being "out in the sun all day, building, wasn't as fun" now I know for a fact this was not a research trip and was most likely a mission trip of sorts. this is a rather big deal because they know I am atheist and I wouldn't empathize (understand) their situation. 

 bells start going off in in my head because looking back I think our professor would have been a bit more lenient given it was research. anyway,  because I realized they lied to me and specifically told me it was a research trip and not church related (then I really would have said you are on your own), I shut down all possibility of communication because I know they want me to teach them stuff they could have at least looked at. I feel terrible because I feel like a shitty friend and I know they won't understand much but also feel like they were definitely just going to use me. 

so, aita for refusing to tutor my  classmate? 

&amp;#x200B;