As others have said, it is considered wrong, though I can say that I understand the thought process that lead you to act as you did, as mine was similar. The problem with this though, is that eventually it becomes harder and harder to keep yourself from having sex. As you engage in sexual activities, the line between what is “ok” and what isn’t starts to blur until eventually you start trying to justify activities which you previously would have never even considered engaging in. My wife and I were fortunate in that we were able to abstain, but the actions we did engage in made it incredibly difficult.
If you truly love this person, you will do what is right for them and show them you love them by treating their body with the respect is deserves, and abstaining from such practices until you are married. It is difficult, I definitely recognize that, but I speak from experience that it is worth it.