Hi---let me say this Im guessing your younger by saying your previous girlfriend was in her finals?. Now from older person point of view --there is no way to protect yourself 100% love is love --good or bad or crazy. I will tell you I recently ended 9 yr relationship because when I became sick --the realtonship went south some people cant handle it --its harsh. Truth is I also didint want to waste another day being with someone who didint want to be my side thru the hard times so i ended it. When it comes to the other stuff u mention like sex doesnt matter what other people say there is no time line ---you both will know when it feels right to both parties. Personally, I think you will see as you get older there is something deeper when u dont have sex for awhile ---sex sometimes if rushed is confused people for love --when sex should be a form of affection to show your love--it become much more meaningful when you wait. I will leave you with this but remember Im old school (smile)---its better to have been loved and lost love then not to have known love at all. You will have many heat breaks in life --but--the heart will heal !! You sound like a great person !!