Your prayer for your son has been heard, and the burden you carry for him is itself a token of love which reflects the greater love of our heavenly Father.
You say he feels alone and without friends, longing for someone to wake with each morning and for true love. There is One who knows that loneliness to the full. Our Lord Jesus knew what it was to be forsaken by all, yet He could say, I am not alone, because the Father is with Me. Even when the conscious display of favor was taken from Him upon the cross, the Father's love abode. Your son, if he be in Christ, is never truly alone, for the Father has compassion upon His returning children. As with the prodigal, the Father did not look with icy eyes, but had compassion and fell upon his neck and kissed him much. That much kissing means much love, a love token for every time of doubt and dismay. Whatever now troubles your son, the Lord has a love token to set it right, and that love is proved not by a momentary feeling but by the great Sacrifice of Christ upon whom all mercy rests.
Know this also, that God hears sinners who come unto Him through Jesus Christ His Son. It is gloriously true that all who come through the appointed way are heard. Prayer has a sure and true influence, for as He is the most high and true God, He cannot deny Himself. You, though you feel puny and low, may speak to God through Christ and move His hand for your son. Continue to cry, Lord increase his faith, Lord draw him nearer to Thyself.
True love is first to be found in Him. Before any other love can satisfy, the heart must know the love abounding of God in Christ, that love which gave His Son as a ransom and which now, for the sake of the Beloved, accepts and perfects all who trust Him. That love is a spark of the eternal flame, and when it is kindled within, it becomes the wellspring from which all other pure love flows. Out of that love to God will come a right ordering of all other loves.
And concerning the true love and companionship for which you pray, we will pray with you according to the good and holy order which God has ordained from the beginning. Marriage is a lifelong covenant of one man and one woman, and the sharing of life and of the marriage bed belongs within that covenant alone. It is there, within faithful and holy marriage, that companionship is blessed of God. To live together apart from that covenant is not the way of blessing, though many now walk in it. We cannot ask God to bless what He has not ordained, but we can and do ask Him to lead your son in the path of purity and truth.
Let us pray together for him.
O Lord our God, look in mercy upon this son who is in trouble and feels alone and without friends. Draw him by Thy Spirit to Thy Son Jesus Christ, that he may know himself reconciled and kissed with much love, and that he may find his first and deepest companionship in Thee. Comfort his loneliness with Thy manifest presence, guide his steps, and set his feet upon a sure foundation. Grant him true friends who love Thee, and keep him from paths which would lead him away from holiness. If it be Thy gracious will, provide for him in Thy timing a godly wife, that he may enter into that lifelong covenant of marriage which Thou hast ordained, and walk therein in love and fidelity to Thy glory. Above all, save him and keep him as Thine own, perfected in Christ. We ask this through Jesus Christ our Lord, in whose name alone is salvation. Amen.
Persevere in prayer, and encourage your son to seek the Lord with his whole heart, trusting that the Father who so loved the Son as to give Him for us will withhold no good thing from those who walk uprightly.