"Love Triangle" but MC's Feelings Never Waiver

At least one secondary character has feelings for one of the leads, but the lead is never torn / the leads' feelings for each other never waiver. In some cases the secondary character's role is very minor or the secondary character never even confesses their feelings. 

Some people wouldn't even consider any of these to be love triangles because the leads never feel torn (although in at least one case they do deny / hesitate to pursue their feelings for a while because of the secondary character).