Dear YWN Username:
The very term “significant other” is a disgusting goyish terminology. We Yidden only have a Choson/Kallah or a Husband/Wife. Nothing else and nothing in-between. Until a couple is engaged they are strangers to each other, no different than when they first met on their first date. It is pure pritzus for any outsider to refer or discuss them as a thing or for either of them to discuss their dating, whomever he/she is, with someone other than their parents/rebbeim.