No one can demand loyalty and fidelity; it can only grow out of trust and respect. The depth of trust, security, and intimacy can only manifest when we are both committed to ourselves and our partner, and give our love freely, never on demand.
How do you take off the "lack glasses" that are keeping you from the abundance of your own life? Keep the focus on you and practice gratitude. It's not about going into a comparison and being grateful because what you have is better than what the other person has.