Struggling to Support My Boyfriend with ED

to preface this, i am not diagnosed with any sort of ED, so i don't want to feel like i'm intruding by posting here. my boyfriend has been struggling lately, but today has been so much worse. he used to be in DBT, i currently am, so I offered to go over a skill with him to see if that would help but he said he's tried. on top of feeling lost and hopeless when it comes to helping him here, i feel like this is having a domino effect on me. like i said, i am not diagnosed with an ED, but the more he talks about his, the clearer it is that my eating patterns are not normal. but that isn't the point, i can use skills to get around certain thoughts. now i want to know how others feel the most supportive when they're struggling? i don't want him to take my not being able to help as enabling