As many as are led by the Spirit of God, they are the Sons of God.
It is non negotiable as a believer to be led by the Spirit concerning issues of this life, especially concerning choosing a life partner.
The primary way The Holy Spirit leads us in the New Testament is by bearing witness with our spirit concerning a matter. This comes as an impression or a strong knowing about the matter.
Notwithstanding, since the believer is not yet perfected, he must understand and admit that he can still miss it concerning the issues of picking the witnesses of the spirit.
Scriptures say we should “prove all things”.
He should still be willing to wait on God in the place of prayers to prove the leading he has received and also for further assurance on the matter.