The answer is simple. Gwen Stacy is Peter's definitive girlfriend, which doesn't matter at all because Mary Jane is his wife. It goes beyond simple boyfriend/girlfriend as the two have developed together for over twenty years to form a strong bond that every other attempt to break them up failed at (trying to have MJ cheat, martial problems and fighting after Harry's death and Peter's fake parents, MJ's stalker and subsequent "death," etc.). OMD/BND will be no different.
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