Dating jealous person
It's common for jealous partners to disown personal responsibility for their jealousy.
Why ruin a perfectly good relationship with negative thoughts? Focus on the good times that you and your partner have together.
Look for ways to address his jealousy by reassuring him about the root causes of his insecurity.
Understand that it will take time for him to feel secure.
If fighting against the urge to cheat is a struggle he faces in every relationship, he likely does not understand a person who doesn't struggle in the same way.
If he feels guilty about times when he has cheated or wanted to cheat, he may carry a sense of unworthiness and feel that he deserves to be cheated on.