The love you share or shared with your partner stems from how you learnt, felt and experienced love as a child from your main care givers..parents.
We learnt by example, so we watched and then copied them...even if it was ugly. We learnt from what we were told many times over the years as a child. We learnt by how we felt and thought from how others treated us…loveable, not loveable.
Now in an ideal world you were with parents who had a loving, respectful relationship and were compassionate, gentle, loving, supporting and encouraging of you. They were able to express, share and be consistent with their love for you. So you grew up knowing, feeling, recognising and being loved which meant loving now comes easy for you and you’re relationship reflects this.