“The Mysteries of Pittsburgh” by Michael Chabon (post 3): Is Parallel Bisexuality (vs. Serial Bisexuality) indicative of multiple personality?

Halfway through the novel, the main issue has been the protagonist’s puzzlement and conflict regarding his sexual orientation. He had long wondered if he were homosexual, since he has long felt attracted to men as well as women. Now, during the summer following his four years of college in Pittsburgh, he is in a loving sexual relationship with a woman, but is also in love with a man.

What strikes me is that these two relationships are happening at the same time, and that these are both loving relationships. It would be just as remarkable if he were in two loving heterosexual relationships at the same time. These are love relationships, not just sexual encounters.

So I’m entertaining the hypothesis that parallel bisexuality—love relationships with both men and women at the same time—may be indicative of multiple personality, because alternate personalities can do contradictory things.

It would help to confirm this hypothesis if the heterosexual protagonist had memory gaps for the gay protagonist. No such memory gaps have been mentioned. But many things in this novel have not been mentioned; for example, all the people he must know in Pittsburgh from the last four years.