Why people do drugs after a breakup?

man i used to deal with i stop seeing him 3 months ago seen him a few days ago to give him closure (he was the cheater and liar having multiple women i wouldn't say breakup but situationship breakup) and he told me he startrd back sippin lean and confessed all this love he has for me but in the same breath said he's not changing but pleaded with me ever since i left him. mind y'all my mom just passed in August and he was so neglectful and it was the icing on the cake. is it regret? or what could his thoughts be during this time.
Why people do drugs after a breakup?
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