expression
a wise man listens to counsel; a worry shared is a worry halved
Proverb meaning that talking things over with someone is beneficial; it can lead to good advice or lighten one's burden.
一人で悩まずに、物は相談と言うから誰かに話してみたら？
Instead of worrying alone, why not talk to someone? As they say, a worry shared is a worry halved.
expression
I've got something to ask you
Used as a conversational opener when you want to seek advice or discuss something with the listener. Often softened with ちょっと or ね.
ちょっと物は相談なんだけど、今時間ある？
I've got something I'd like to ask you—do you have a moment?
相談 is the noun 'consultation' or 'advice-seeking'; 物は相談 is a set phrase that uses it to mean 'talking things over is valuable' or as a request for advice.
A set phrase combining 物 (thing, matter) with the topic particle は and 相談 (consultation). The exact origin is uncertain, but it likely developed as a proverbial expression emphasizing the value of discussing matters with others.