where in the bible does it state he specifically needs to seek advice from an older male person?
It's not explicitly stated and you can make excuses to yourself and for him, but he is out of line telling you business about his wife and marriage.
Is he a pastor or Sunday school teacher?
Is there some reason you CAN NOT avoid him or do you just choose not to?
You can't be a compassionate ear that will help him and his marriage heal. You are the "other woman". Even if he hasn't kissed you, he is commiting emotional adultery talking to you about issues he should talk with his wife or a trained marriage counselor about.
Do you actually want to help him or do you just want to own him and not be lonely?
If you want to help him and yourself, you will not meet with him privately and stop finding reasons why he should be divorced and with you instead.
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Titus: 2. 2. That the aged men be sober, grave, temperate, sound in faith, in charity, in patience. 3. The aged women likewise, that they be in behaviour as becometh holiness, not false accusers, not given to much wine, teachers of good things; 4. That they may teach the young women to be sober, to love their husbands, to love their children, 5. To be discreet, chaste, keepers at home, good, obedient to their own husbands, that the word of God be not blasphemed. 6. Young men likewise exhort to be sober minded. 7. In all things shewing thyself a pattern of good works: in doctrine shewing uncorruptness, gravity, sincerity, 8. Sound speech, that cannot be condemned; that he that is of the contrary part may be ashamed, having no evil thing to say of you. 11. For the grace of God that bringeth salvation hath appeared to all men, 12. Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world; 13. Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ; 14. Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works. 15. These things speak, and exhort, and rebuke with all authority. Let no man despise thee. -