Its possible I missed this in my skimming, but would either your boyfriend's parents or your parents take obie? You could still visit and love him but wouldn't stress out your other cats. There are ways to introduce cats, but sometimes this just won't work. My roommate and I have lived together for over a year and a half and her cat still hisses at mine. My cat is totally calm around the other cat, but it just doesn't work for them. For the most part, she keeps her cat in her bedroom since she has the huge master bedroom and my cat wanders the house. (Though this a point of contention because she locks my cat in my room if I'm not around and it makes me so mad but that is off topic lol).
Anyway, another step to introducing cats in addition to what everyone else has suggested is to feed them near each other. Start with feeding them on opposite sides of a door, then feed them together in a room, but with their bowls on opposite ends, then put the bowls next to each other. Obviously take it slow, but if they know they have to be around the other cat to eat, they'll get used to it. (I've not personally used this method with my own cat as my roommate was too worried about stressing her own cat out blah blah blah to attempt to properly introduce our cats but ANYWAY).
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