I realise that this is not the main focus of the thread littleMillie but I want to comment on your expectation that men in general are more likely to "hit on" a single woman than a married woman, your reasoning being that they would regard a single woman as "available" and a married woman as "taken".
My experience has been the exact opposite. There are plenty of men on the look out for "no strings attached" relationships as well as men looking nothing more than a quick leg-over or blow job. A wedding ring is a magnet to both these kinds of men.
The fact that you are already hitched means, to their minds, that they are not in danger of you "getting serious" and wanting more from them than sex.
The main reason that your wedding ring makes you a target is that most of them are either married or are in a long-term relationship. They do not want to jeopardise that by hooking up with a woman who might interfere with their habit of covert, serial adultery/infidelity.
Beware in particular men who you might currently consider "just good friends" and men who are good friends with your new husband. They are the ones most likely to catch you off your guard and disappoint you by hitting on you as early as your wedding reception.
Meanwhile, your driving instructor is a disgusting pervert who is seeing how far you will let him push it. He will keep pushing further and further if you let him, until one day you are fighting him off because he has grabbed your crotch or breast or lunged at you sticking his tongue down your throat.
Then he will get frighteningly angry with you for "leading him on". Later he will tell other people to watch out for you because you came on to him and he had to fight you off. Awful woman that you are, he will say he wonders if your boyfriend/fiancée/husband knows what he is getting himself into?
Being a driving instructor is the perfect job for men like him. Not only is he alone with you but it is crucial to your success and safety that you regard him as authoritative and obey him when he instructs. He uses this psychological dependency to his advantage.
The whole basis of your working relationship is that you must comply with his demands. This grooms you to "tolerate" his first, minor boundary violation and it fucks with your mind. It is not just fear that makes you freeze, it is also confusion: surely this lovely, respected older man would not be abusing his position of trust? It must be you, you must have misunderstood.
No, you have not misunderstood. You can trust your instincts.
Get out now and report him 🙏