When I was 21, I was engaged to a potential "Jeffrey". Thank God I got out of that realationship before it was too late. Don't blame the victim in this type of situation. It doesn't start out ugly. It starts out fairly normal, and turns uglier and scarier over time.
I dated this guy for two years, and by the time I had to break it off, he was totally and completely obsessed. Some of his behaviour towards the end;
If I went out with the girls, he would leave a rose on my doorstep (we did not live together) and sign it 'from the guy you met last night' (To see if I DID meet someone and would tell him or not about the rose).
He had NO friends of his own, and was not liked by those who knew him.
He could not hold a job and it was ALWAYS the fault of his boss.
He would call my house every night at 5:10 , even as I was putting my key in the front door getting home from work. (Had to know I was home)
He told me he cried all the way to his vehicle after dropping me off at the airport to visit my brother in another state (weird!)
I came to realize that I had to get OUT of this relationship, and I was scared. After dating the guy for two years, and being engaged for two months, I got the strength to break it off. And I will tell you, when the guy is obsessive, and unstable, this is a VERY frightening thing to do. So much so, that I even hid my set of kitchen knives that night. I was that unsure of how he would react.
He was horribly upset, and did stalk me for a while after that, but we did finally go our separate ways. But to make sure, I did move to another city. This was over 20 years ago, and I still remember it vividly.
What for those warning signs, don't ignore, and get out before it's too late.