Does anybody know any saints who would be good to pray to for dating relationships and struggles involving this? Or maybe some specific prayers that people have found powerful in this topic?
While we are at it, if I could ask for your prayers for a specific intention regarding a relationship, I would be very appreciative.
God bless!
Saint Raphael is the saint for never married Catholics seeking a spouse.
Here is one prayer to him:
Prayer to Archangel Raphael for A Marriage Partner
Glorious Saint Raphael, Patron and lover of the young, I feel the need of calling to you and of pleading for your help. In all confidence I open my heart to you to beg your guidance and assistance in the important task of planning my future. Obtain for me through your intercession the light of God’s grace so that I may decide wisely concerning the person who is to be my partner through life. Angel of Happy Meetings, lead us by the hand to find each other. May all our movements be guided by your light and transfigured by your joy. As you led the young Tobias to Sara and opened up a new life of happiness with her to holy marriage, lead me to such a one whom in your angelic wisdom you judge best suited to be united with me in marriage.
Saint Raphael, loving Patron of those seeking a marriage partner, help me in this supreme decision of my life. Find for me as a help‑mate in life the person whose character may reflect some of the traits of Jesus and Mary. May he (she) be upright, loyal, pure, sincere and noble, so that with united efforts and with chaste and unselfish love we both may strive to perfect ourselves in soul and body, as well as the children it may please God to e*trust to our care.
Saint Raphael, Angel of chaste courtship, bless our friendship and our love that sin may have no part in it. May our mutual love bind us so closely that our future home may ever be most like the home of the Holy Family of Nazareth. Offer your prayers to God for the both of us and obtain the blessing of God upon our marriage, as you were the herald of blessing for the marriage of Tobias and Sara.
Saint Raphael, Friend of the young, be my Friend, for I shall always be yours. I desire ever to invoke you in my needs. To your special care I entrust the decision I am to make as to my future husband (wife). Direct me to the person with whom I can best cooperate in doing God’s Holy Will, with whom I can live in peace, love, and harmony in this life, and attain to eternal joy in the next. Amen.
In honor of Saint Raphael: Our Father. Hail Mary. Glory Be.
Our Lady of the Angels, pray for us!
We are currently saying this prayer and many others like it in this thread here if you’d like to join us: forums.catholic-questions.org/showthread.php?t=876460
I would recommend St. Maria Goretti. 
She’s the patron saint of purity and (I suppose by that effect) holy relationships. I’ve said a novena asking for her intercession before, and it was absolutely one of the most faith-growing times (if not the most) of my life. Amazing things happened, and I praise God and thank St. Maria for her part in it.
I’ll be praying for you and your search for a holy relationship!
God bless,
Hailey
I prayed to St. Raphael the Archangel regarding my own husband. Our lectors and attendants wore maroon and white in his honor as a result. One of them is now a priest for the diocese in which we married.
St. Maria Goretti is my own patroness.
Here are a couple of proposed religious communities to honor them both.
Raphaelites: cloisters.tripod.com/raphaelites/
Nuns of the Purity of the Most Holy Virgin Mary & St. Maria Goretti:
cloisters.tripod.com/whitenuns/
The Associates of Our Lady of Purity already have two members, both of whom are in the UK. Three members if I’m included.
Blessings,
Cloisters