Only and Only if you have no chances of getting remarried.
Highly Highly Mustahab.
The Messenger of Allah (S) has said, "There is no foundation that has been built in Islam more loved by Allah, (The Greatest and Noblest) than marriage."
This hadith shows us the great importance that Allah سُبْحَانَهُ وَ تَعَالَى and His Messenger (S) have placed on marriage, such that it is the most loved foundation or establishment upon which the Muslim man and woman can build their life upon. If such a foundation is built with love, honesty, sincerity and true faith in Allah سُبْحَانَهُ وَ تَعَالَى and all that He has commanded, then there is nothing that could destroy such a firm building.
It has been narrated from Abi Abdillah that, "A man once came to my father. My father asked him, "Are you married?" The man replied, 'No.' My father (as) replied, 'I would not love to have the world and all that is contained within it if it meant I had to spend one night without a woman (beside me).'"
This saying from our sixth Imam (as) shows the importance that the rightful successors of the Prophet (S) placed on marriage. In this hadith, we are told that the Imam (as) would not even trade all the beauties and material treasures that exist in the world, if it means that he had to spend even one night alone! This may point to the fact that the evil whisperings of Shaitan may penetrate a single man or woman to go towards the prohibited and thus, contaminate his or her faith and belief.
"And of His signs is that He has created spouses for yourselves from your own selves so you might take comfort in them and He has created love and mercy among both of you. In this there is evidence (of the truth) for the people who (carefully) think." (Surah 30, Verse 21).
Really? Spiritual? GET A WIFE/HUSBAND!! Don't be like Iblis who said - God I want to worship you but the way I want to. (Not prostrating to Adam)
Complete Submission is to follow what God Wills.