Three tangible ways I can personally improve my relationships with Chrsitians from other traditions is as follows:
1. I have a dear friend from college who is Coptic Egyptian Christian. She actually invited me to her church (any Sunday that suits my schedule), which is about an hour and a half away from me — she said it would be a blessing for me to visit. I am really grateful for her openness and welcomingness, and look forward to finding a time soon to a Coptic Egyptian Christian service (especially considering that we are all, as Christians, still in the season of Lent!).
2. I could return the favor, so to speak, and invite this same Coptic Christian friend to my own church. I could also introduce her to some of my Catholic friends and we could all chat compassionately sometime over a walk, coffee, or dinner (and talk not even about our churches, necessarily; just to be in community and fellowship with one another).
3. I can pray for a spirit of peace and a spirit of humility to connect with other Christians through opportunities that God creates/sees fit.