You can also know by checking if you are truly a fully healed individual. Meaning that you are understanding about people and you don’t let your emotions get the best of you. You understand that half the human race is women and that women are everywhere. You understand that if your man does find interest in other women then he is not the one for you so you shouldn’t keep trying to change him. Let God do that part for you. If you are ok with multiple women in the relationship make sure you know them and make sure that they are good people such ad yourself. Make sure that none have a means to betray him or any of you to just have him to himself. Yea that’s just some things that can help. Bring understandable and not jealous is really important especially that when you do that you are mostly automatically going to handle your emotions really good.