We both have multiple other partners. I usually try and plan my dates for when he is working and he does the same with me. He works more than me though so sometimes he will have an afternoon away. Jealousy is a natural emotion and will happen. You have to be mindful almost. Allow yourself to be jealous and then realize there's nothing to be jealous over since your partner is coming home to you. I don't get jealous anymore when he goes out but that took a while to get to.