My ex wants to change his ways to make us work, this includes putting me first and cutting down on drinks and other substances. Do I give us a chance?

Apart from the above we had a happy relationship but I was sick of him putting his friends first and always wanting to drink and do other substances. He has told me how happy he was with me and now he wants to change his ways.

My ex wants to change his ways to make us work, this includes putting me first and cutting down on drinks and other substances. Do I give us a chance?
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