The bible states that, "God is a jealous God that you shall have no other God besides me." But it is also states that Love is not jealous in describing Love. So, you know what incoming next, If God is Love and Love is not jealous, what is the point? Do you see the contradiction? But Jesus also mentions, "You cannot serve two masters. Either you love one or hate the other one. You cannot serve God and Money." And so God is right! God is Love and He wants you to serve Him only shall you serve.
Now the real issue, many people struggle in relationship because of they are or someone is jealous over other wife, husband, boyfriend and girlfriend or personal possessions. I know it is easy to say this "You should stay away from other's personal belonging or what is not yours" But is hard to do. Because you have to go through the phsycylogical emotions, feelings and thoughts of yours. And sometimes you take actions which lead to sin. It is common throughout history and even the scripture. For example, King David and Barsheeba relationship. King Saul and King David. Tum and Teav and MacTheourng. And even the movie Tatanic and etc. That is why Jesus teaches about marriage and adultery and the covet laws about "If someone take your coat and also give away(I forgot this verse)etc."
Though all and all, if these things are in your life right now, please do let your emotions, feelings, thoughts or actions lead to sin. If you have already sin against these things(jealous), please repent, pray and overcome them. Because like the spirit of the seven churchs and bride is to repent and overcome. Thank you and peace be with you!