How do I sign outta my gmail account if I no longer have phone, ex boyfriend took it

Basically, he & I share a phone bill, however he is a.... in as nice terms as possible, not nice person & has taken phone back, i haven't even had it a month.. he didnt give me a chance to even back up- anything new I may have had. Oh & to make it funny, we are fighting in first place because he CHEATED!!! WTF HElp I juat want to be done with him!!!! To hurt to refover from this ish

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