Failed relationships happen so much because of stress, and unhappiness in their life. Working on having a successful relationships, whether it's with our partners, children, parents, friends, or family, is one very important life skills we can all learn. If we cannot maintain and keep a lasting relationships with someone that you care for, we will always then struggle to be happy.
Jealousy often occurs when there is a lot of feeling that one has such as separation and competition. We can easily become jealous of our closest friends or even your partner. We need to learn to be happy for the success of other and try and learn from them. Also, we need to trust our partner or anyone because it is better to be trusting of someone then rather always suspecting something going on or they are being disloyal to you. If our partner lets us down, it is not our fault.
But, if you suspect that they are because of our own insecurity, you may end up pushing them away. When you don't trust it's how you can start to create problems in your own relationships.
There is a very large difference between real true love and emotional attachment to a person. When people have emotional attachment to someone, they always need their attention from them and they will be stuck to you like glue. Most people can't see when they have excessive attachment to others, they easily become jealous and demanding over you. Sometimes attachment occurs out of insecurity that person may have. If this is true then they need to start developing self-belief and inner confidence in them self's, we can't just rely on other people to provide that for us. Strong relationships need a certain detachment and time apart from each other.