Well, a relationship got "too much" for me, but I don't think I realized it until much later...
I was with a guy for a year, and he treated my quite terribly, not so bad at first, but it got pregressively worse. I thought I loved him, so I took it. At least I learned something from it. But it got so bad that he made me feel like every little thing that went wrong for him was my fault. Looking back at it now, I can see little things that indicate that it really was too much, especially emotionally, but I couldn't see that then, and I guess Jack was in a similar situation; he loved Ennis so damn much. For example, one night we were sleeping at his place and he had left the window open, and it started pouring raining out and the rain got in on everything: his TV, his computer, important documents on his desk..etc. He woke up and started freaking out. He was so mad. When I awoke, I didn't know what was going on, and my first reaction to his anger was "I'm sorry! I'm sorry!". I just blurted it out, almost instinctively. I didn't even know what I was appologizing for, and of course it was in no way my fault. I wish I had noticed things like this while we were still together and before he had the chance to break my heart. But I've learned from it and am grateful for that much. I know it doesn't completely relate to the "too much" that Jack endured, but nonetheless..