When I was single I would not consider anyone other than a practicing Catholic. A protestant practicing their faith would be like trying to fit a square peg into a round hole.
Do you want your life partner to be with you in church, receive the Eucharist reverently, go to confession, do the sign of the cross? Do you want your partner to model that for any children you would be blessed to have? Would you want someone who goes to the Blessed Mother for guidance and strength because there will be difficult days over the years together. The rosary is powerful. A protestant partner will protest these things that give us life! Don’t even start down that path. Wisdom to you!