彼はよく気が変わる

Meaning
he changes his mind often

Vocab used in this sentence

he, his, him, boyfriend
a, the, is, am, are, will
よく
often, well, good, common, frequently, commonly
care, mind, air, bother, mood, atmosphere, spirit
is, there, but, ga, will, however
変わる
change, to change, vary, veer

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