That your boyfriend can't accept your perfectly reasonable explanation for that one stray condom, CRASH, has me wondering if the recent talk about buying a house and having kids might be the actual issue. Is he looking for an excuse to dump you, and the stray condom is a convenient casus belli? Or is he really that jealous and insecure? If he doesn't want to buy a house and have kids, then you obviously shouldn't buy a house or have kids with him. But the same goes if he's really this jealous and insecure. You don't want to be saddled with a partner who sees evidence of infidelity where none exists, CRASH, because life is a parade of incidents and ephemera—an easily misinterpreted text message from a male co-worker, a stray pair of underpants left behind by a boyfriend who predates him, a cute waiter/barista/personal trainer who catches your eye—that could potentially set him off.