Welcome to the Migraine and Headaches Forum! This forum is for questions and support regarding migraine and headache issues such as: abdominal
migraines, headaches caused by allergies, cluster headaches,
headaches, headaches in children, migraine headaches, sinus headaches, tension headaches, visual disturbances.
The answer to your question would depend on whether your boyfriend experiences the migraine headache during or immediately after drinking alcoholic beverages. If it occurs at a much later time, a relation would be unlikely.
However, one headache that is very common as a result of drinking alcohol is a "hangover".
In any case, you should try to talk to your boyfriend to stop, or at least minimize, his alcohol drinking because of so many other probable and definite bad health effects.
Hope this answers your query.