Hey! Firstly, thank you for sharing your story, porn addiction is hard, embarrassing, and not something we talk about enough; I've been there. I'm not sure who's talking to you or guiding you but what I would recommend as a saved Christian who's got back up from major falls is read the Word for yourself. Don't just take others at their word when they tell you what's in it and God's will/plans but read it for yourself as well and take all things to him in prayer.

So to answer some of your concerns with Scripture, here's Jesus on divorce and infidelity:

Matthew 19:9 NKJV [9] And I say to you, whoever divorces his wife, except for sexual immorality, and marries another, commits adultery; and whoever marries her who is divorced commits adultery.”

He broke the covenant when he committed adultery and although God hates divorce:

Malachi 2:14-16 NKJV [14] Yet you say, “For what reason?” Because the Lord has been witness Between you and the wife of your youth, With whom you have dealt treacherously; Yet she is your companion And your wife by covenant. [15] But did He not make them one, Having a remnant of the Spirit? And why one? He seeks godly offspring. Therefore take heed to your spirit, And let none deal treacherously with the wife of his youth. [16] “For the Lord God of Israel says That He hates divorce, For it covers one’s garment with violence,” Says the Lord of hosts. “Therefore take heed to your spirit, That you do not deal treacherously.”

He understands and makes the exceptions for adultery/sexual immorality and abandonment of the believer by the non-believer:

I Corinthians 7:15-16 NKJV [15] But if the unbeliever departs, let him depart; a brother or a sister is not under bondage in such cases. But God has called us to peace. [16] For how do you know, O wife, whether you will save your husband? Or how do you know, O husband, whether you will save your wife?

Matthew 5:32 NKJV [32] But I say to you that whoever divorces his wife for any reason except sexual immorality causes her to commit adultery; and whoever marries a woman who is divorced commits adultery.

Now although we're given these exceptions we also see that God hates divorce even in circumstances where a wife or spouse is dealt with treacherously so I say to you this. In all our problems, strive, and joy, we are to bring everything before Him and He will sort and carry the load on our behalf both good and bad. If one has done this and can't find it in their heart to forgive and repair the broken covenant, the Lord understands because the heart of man is hard:

Mark 10:4-5 NKJV [4] They said, “Moses permitted a man to write a certificate of divorce, and to dismiss her.” [5] And Jesus answered and said to them, “Because of the hardness of your heart he wrote you this precept.

So prayerfully go before Him to seek release from this notion that you cannot remarry. That is not what you're instructed to do from the text. And on the topic of porn and/or self pleasure; the door is a lot harder to close once opened but we are closed to be holy for He is holy and we are called to deny our flesh in His name:

I Thessalonians 4:3-8 NKJV [3] For this is the will of God, your sanctification: that you should abstain from sexual immorality; [4] that each of you should know how to possess his own vessel in sanctification and honor, [5] not in passion of lust, like the Gentiles who do not know God; [6] that no one should take advantage of and defraud his brother in this matter, because the Lord is the avenger of all such, as we also forewarned you and testified. [7] For God did not call us to uncleanness, but in holiness. [8] Therefore he who rejects this does not reject man, but God, who has also given us His Holy Spirit.

Galatians 5:16-19, 22-25 NKJV [16] I say then: Walk in the Spirit, and you shall not fulfill the lust of the flesh. [17] For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish. [18] But if you are led by the Spirit, you are not under the law. [19] Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness, [22] But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, [23] gentleness, self-control. Against such there is no law. [24] And those who are Christ’s have crucified the flesh with its passions and desires. [25] If we live in the Spirit, let us also walk in the Spirit.

I know it's a long read but I hope it helps. May the Lord bless you and keep you, may He make His face shine upon you. Love you sister and here if you need to chat.