In the name of Allah, We praise Him, seek His help and ask for His forgiveness. Whoever Allah guides none can misguide, and whoever He allows falling astray, none can guide them aright. We bear witness that there is no one (no idol, no person,  no grave, no prophet,  no imam,  no dai,  nobody!) worthy of worship but Allah Alone, and we bear witness that Muhammad (saws) is His slave-servant and the seal of His Messengers. Allah Says:
And among His Signs is this that He created for you mates from among yourselves that ye may dwell in tranquillity with them, and He has put love and mercy between your (hearts); verily in that are Signs for those who reflect.
Quran Chapter 30 Surah Rome verse 21
Dear and beloved brother in Islam, regardless of the conditions that led to your marriage, if you have married the sister, then it is absolutely obligatory upon you to honor your vows of marriage and give your wife her rights in full. If you do not fulfill your rights due to your wife in marriage, you will be guilty of transgression and injustice in the Just and Supreme Court of Allah Subhanah in the Hereafter.
We used to practice coitus interruptus during the lifetime of Allah’s Messenger (saws), while the Qur’an was being Revealed.
When some of the companions of the Prophet (saws) wished to space their children, they would practice the concept called ‘coitus interruptus’ meaning at the exact time of ejaculation, they would remove their private organs from their wives. Although when asked, the Messenger of Allah (saws) did not encourage it, he did not declare it forbidden.
Narrated byJ abir -Sahih Al-Bukhari Hadith 7.136
So when we intended to do coitus interruptus, we said, ‘How can we do coitus interruptus before asking Allah’s Messenger (saws) who is present among us?’ We asked (him) about it and he (saws) said, ‘It is better for you not to do so, for if any soul is predestined to exist, it will exist.’ ”
Narrated by Ibn Muhairiz – Sahih Al-Bukhari Hadith 5.459
The use of condoms serves the same purpose as the process of ‘coitus interruptus’; and if one’s intention in using it is to space one’s children, there is no sin.  But if one uses it to prevent having children permanently, then it would indeed be against the principles of Islam and a grave sin in the sight of Allah Subhanah.
If one trusts, obeys and follows the guidance and commands of Allah and His Messenger (saws),   one can be assured of never ever being misled;   but if one believes, obeys and follows any other guidance, other than that of Allah and His Messenger (saws), one can be assured of being led astray.
Whatever written of Truth and benefit is only due to Allah’s Assistance and Guidance, and whatever of error is of me alone. Allah Alone Knows Best and He is the Only Source of Strength.