We have some cultural norms that allow for unmarried people to sit around kissing, making out, whatever it is called these days, then they get handsy, or whatever.
Even with kissing or even hand-holding, you have to be very careful. We are wired to show affection and have sex with our spouses. The lusts of the flesh don't care if you are married or not. Bodily reactions and desires kick in whether you are married or not.
If you date a man, at some point you should let him know you have fallen in this area in the past, but let him know you aren't going to sit around with him in the dark in a parked car, make out on a couch, etc. if you aren't married.
If the man had an outright intention to seduce you, maybe he was a bit more to blame. Otherwise, it would be strange to judge him as a predator for doing the same thing you did. If he considers it a sin, repents before God, who knows, maybe you two could have a relationship that goes the distance, if he wants to propose. If he's just acting religious to get religious girls to sleep with him, and he's a vegan around vegan girls he's trying to sleep with, etc., you'd need to get rid of a guy like that. Some of those guys may choose to move on by themselves.