Can I marry this man?

He is now a 30-year-old serious man of God, fully repentant, but when was 20 he married an unbeliever girl for the sole purpose of becoming an european citizen since he is latin american.

He got the papers and tried to have a life with her for a few months but things didn’t work out so they filed for divorce.

While they lived together they had sex and while they were separated (the divorce wasn’t fully completed yet) he slept with another woman (committing adultery imo).

My question are,

1 Do you think this marriage was valid (a real covenant before God)? He said he was a christian back then as well so I assume it was a real marriage even if he got married in a church.

2 Is the divorce valid or he’s still married spiritually?

According to the “Pauline’s privilege” in the bible that says that if an unbeliever leaves the believer, technically he should be free. HOWEVER he told me that he brought his ex-wife to church with him for a few months so I assume he probably accepted Christ, however he’s saying to me that she’s not a christian at all and she only went to church because she liked the environment/community.

After they got divorced, he felt deeply convicted and tried desperately to reconcile with her, but she didn’t want to take him back (also because be cheated of course), so even if he tried for months he eventually gave up and moved on.

He tried getting counselling from many pastors to figure out if he can re-marry. One pastor said that he’s not a real christian and made him cry for weeks, another one said to him that if he repented and she was an unbeliever for real then he’s completely free to re-marry whoever he wants.

However he cheated first anyway, I can understand her for not wanting him back. And what if she actually was a christian?

Although he said that she is/was pro-LGBTQ and all these woke stuff, doesn’t sound very christian indeed, this is why I’m prone to believe him.

He’s also a very honest radical man of God. Ever since I talk to him I’m closer to Jesus and he helps me in my walk, together we would be a great biblical christian couple because we’re very equally yoked.

However I have a lot of fear of God and I want to make sure I would not commit adultery by marrying this man.

What do you think?

Thank you very much.