Oh I was about to write same but you said it .
Yes guys this is the reason. According to people he's now available again after losing his child (which he didn't ofcourse).
That Prince was checking that too in the last chapter by releasing pheromones. If he really lost his child or wasn't pregnant again , Theo wouldn't have reacted to his pheromones.
This is how they check if omegas have partners or not . A marked Or pregnant Omega negatively responds to Strangers pheromones.
Theo showed aversion but he's no Omega which can be marked , that's how that Psycho knew he got new Capri with new pregnency.
(But Us audience know it's same Capri and 2nd pregnancy)
Dude has no chance with Theo in this Life
Why does theo need another capri?? He's no longer a smyrna right? Is it for the baby to hatch successfully??