i have no issue with bisexuals.... they like what they like.... if i were exclusive with a bisexual, i would only expect that they be monogamous as i would be with them....
as for the thrusting of gay things, i can understand that.... a bisexual may not be as immersed in the gay 'scene' as a 100% gay person, and may not necessarily adopt certain gay stereotypes and characteristics.... he might hang out in places or with people that are homophobic to different degrees, or he might simply not be in to hanging out in gay bars/clubs, getting in to 'campy' things, etc....
the impression i'm getting about this relationship you're describing is that there are 2 people dating who come from seemingly different lifestyles and one is trying to change the other.... that isn't right, and in the context of a relationship there should not be any sense of insecurity on either side.... these two can either talk about it and work it out, or they can part ways before something totally unnecessary happens.... if they decide to just ride it out and something bad does happen, that's their problem....