imagine having an ex-husband who wants to get back together with you (it was an amicable parting, but it was due to him doing something you would neither forgive not forget), and your new husband Loki often getting jealous because of it.
Loki knows 100% that you love him and won't look at anyone else besides him, as you've said so and shown it in your actions. That doesn't stop him from glaring down your ex-husband, however.
Since you've already told your ex-husband very clearly that you refuse to get back to him, whenever he approaches you again, you outright ignore him. Loki is quite pleased with your attitude... And you reap the benefits at home.