love triangle (please comment, really need advice)

ive been with my partner for almost 4 years and we have a child together but for ages now we haven't been getting on as well as we used to and we have huge fights. whenever im upset or lonely his brother is always there for me, he is a lot nicer than my partner and i like him probably more than i should, i know he likes me too but we're just off limits to each other, what am i supposed to do 😕

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