People don't want to be alone. The way that we bond and feel like we are more than just a solitary creature is through love. When we love, it is not just our heart and mind that occupies our body, it is also the heart and mind of another person.
t's what makes life worth it.
When I say I love some thing, I believe I am mentally, establishing a commitment and a loyalty to this thing. There is something about it that justifies my desire to want to be "attached" to or to love it. :)