Romantic Doubts Romantic Gains

Sometime after arc 4, Subaru is frustrated due to the fact that his relationship with Emilia hasn't advanced romantically, and he is losing hope of ever winning her affections, and of ever finding love. Luckily for him, there is a certain demihuman maid that holds romantic feelings for him. But will he continuously seek Emilia's heart, or will he accept Frederica instead?