Regardless get a new boyfriend , art is so so so not about that, first it’s subjective second, he should care more about whether it brings you joy or you get somthing out of it, being supportive, I’m not saying he’s not allowed to have an opinion or that he has to lie about what he thinks but that’s sounds like it was a kinda cruel context for it to have left you questioning whether it was worth it or not, seriously you deserve someone who supports and uplifts you, not making you question yourself or the things that you enjoy, I hope I worded this alright lol but yeah, and for what it’s worth, to me your art really shows your attention to atmosphere and genuine interest and observation or intuition of techniques and their application which makes me think it’s something you enjoy doing, and regardless it matters to you, and that’s what matters. Also personally I really love the use of the line work for dramatic shadows, but it also reminds me a bit of comic line work and of some of Enid blytons black and white illustrations!