<human>: My boyfriend and I have been dating for a little longer than a year. We're both in the same university, where I am in the First Year and he is in the Fifth Year (we go to architecture school in India).

Recently, when we were getting drunk together with a bunch of other friends, he admitted to the whole group that he didn't turn in a mandatory term paper, and somehow got away with it by lying (how exactly he did it is a long story, and quite unnecessary here). 

I am upset because I used to discuss that paper of his a lot a couple of months ago, and he would always give me positive responses like "I am working really hard on it" and "I'm almost done", etc. I was also with him when he found out what grade he got on that course, and we high-fived each other and everything because he had scored a good grade. 

Later, after we were done hanging out with the group, I mentioned to him that I was upset about him having lied to me the whole time about his paper. He said that he often lies to "protect" people he loves.

I let it go that night, but the more I thought about it, the more upset I got.  Yesterday, I made him meet me, and just bawled my eyes out. He promised that he won't lie to me again. But I still feel absolutely hurt and betrayed. 

First, I'm sad that he would pull off a scam like that for a course- he feels like a different person to me now. Second, I can't believe he justified his lying to me- his original stance was that I need to be protected from the things he does! Thing is, he's always been protective and almost paternal towards me (mostly because he's 3 years my senior in college), but I think lying is taking it to another, wholly unacceptable level.  

We're fine now, but I'm still hurting, and I am wondering if I am over-reacting. Should I take his promise and be trusting again? Am I being a bad girlfriend by being too hard on him?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Boyfriend lied to me about something grades-related, tells me that he often lies to protect me. He said he won't lie any more, but I'm still extremely upset. Is that acceptable?