[My husband divorced me to remarry a woman half his age, he wanted more kids and he didn't want to adopt. So in all fairness I should be fine dating.......]

I'm sorry Anna, but your and my ideas of fairness have nothing to do with it. Our society's ideas about fairness have nothing to do with it. Our churches' ideas aboout fairness have nothing to do with it. But God's words have everything to do with it.

Rom 7:1 Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?
Rom 7:2 For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.
Rom 7:3 So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.

1Co 7:39 The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.
1Co 7:40 But she is happier if she so abide, after my judgment: and I think also that I have the Spirit of God.

These are explicit factual statements. In all of the bible's teaching statements there is no contradiction to this. The KJV and Rotherham mistranslate a verse in Deut. 24 that has confused many, but the "allowance" there for a divorced woman to remarry while her husband yet lives does not exist in any other translations I am aware of, nor, more importantly, in the hebrew itself. Even in kjv english, the whole argument there has nothing to do with an allowance for a woman's remarriage, but rather everything to do with her being defiled by remarriage.
Jesus said a man who divorced his wife except for the grounds of fornication, CAUSED her to commit adultery. Now surely such a man is more guilty than the divorced wife, since he has CAUSED her to sin. But that does not mean that she has not sinned, does it? Or that the sin is not terrible?

I hope you will look up every verse in the bible regarding marriage and divorce before you answer this man's proposal. Every verse.