I am very close to DN and he talks to me a lot. He's just turned 17 but he's been in a committed relationships since he was 14. We all like his gf, she's absolutely lovely. DN adores her and feels she's the love of his life, the right person for him, etc. However, he also has urges to be with other people, and worries about cheating on her when he goes to uni. At the same time he worries that if he loses his gf, he'll never find anyone like her and he'll make the mistake of his life. She is in a permanent state of anxiety over him leaving her. Obviously life will probably take care of this naturally, but I would also like to know how to best support DN through this. I don't know, perhaps there are books or relevant movies about this? This whole thing is taking up so much of his energy and he seems to be soaking up a lot of his gf's anxiety.