We were not in that confessional, so, it is difficult to chime in.
I would suggest you make an appointment with Father outside of confession time and talk to him. He may sense that you do not have contrition, that there is resistance to removing the near occasion of sin.
If you were my sister, I would advise you to turn down the burner. What you are doing now is not working if you keep falling into sexual sin. For 3 months, hang out only in groups/public places. No late night phone calls, texts or Sype. Get back to where you are serious about staying out of sin.
Have serious discussions about why you are not planning marriage. Find a spiritual director.
If you two know that this is the person you want to marry, then, decide you are going to start from a clean slate and not play around on the slippery slope.
Talk to Father, ask if that is the sort of break he is suggesting.