At the beginning love and infatuation feel very similar, that heady feeling where you can't stop thinking about each other and can't bear to spend time apart, This feeling does wane with time and if this is nothing more than infatuation then the relationship may die. However if you are truly in love this heady feeling will be replaced with something more solid and dependable and you can build on it so that it will last a lifetime.
When I look back on my early relationships I often thought I was in love but I didn't truly fall in love until I met my husband, It was different because as time went on I loved him more not less. That's how I knew that the relationship was special. It didn't work out in the long term but that was because he fell out of love with me. I would have stayed with him forever,