I hate to say it, but the phrase "you need to be totally happy to find a partner" seems to be just another social shit test.

No one gets a partner if they are not getting anything from it.

Sure, you can be comfortable being alone and even live a relatively happy life, but if you want a partner and you don't have any, you will feel incomplete or inadequate at some level.

This phrase is rather a shit test for men, as many will not get any partner anyway no matter how happy they are. Taht phrase is also a cope for women, who claim to be happy alone but at the same time forget about it if the hot guy comes, even if he c*ms and dumps her soon after.