<human>: Provide a brief overview of the text.

I'll start with a history.  We have been together 3 1/2 years.  Lived near each other for 2yrs, broke up, I moved really far away to live with my folks and go to school, got back together a few months later, now in LDR and see each other in person about every few months plus skype for the past 1 1/2 years.  Both have about a year left in school (both 27 and working on second career degrees) and have talked about getting married and build a life together after school.  

Here is my issue, I have trust issues from past relationships.  We have done awesome for the past 1 1/2 years of LDR, even though it has been a struggle for me at times, I have worked hard to not project my trust issues onto him.  He is a good guy, treats me good, loves me to pieces and I don't believe in my heart that he would cheat on me, but I worry about it at times. 

Recently he has seemed withdrawn which I chalked up to long days at school. He is working on a math based degree that is really consuming (this is why we broke up and I moved). While on skype I noticed that he had done some "personal grooming" which he normally does not do unless we are going to be together.  I froze.  He saw and asked me what was wrong, I said nothing (of course) and he told me he did it for comfort and knew what I was thinking.  I said that I was dealing with my issues and that he didn't do anything wrong.  We were fine and pretty much left it at that.  

I REALLY love this guy, want to build my future with him and don't want to hurt our relationship with my issues.  He is the one that started the marriage and babies talk so I know he wants the same with me.  
Am I being overly jealous and worried for my mind to fly right to "omg what if he is cheating" or is that thought process justified?  Does anyone have advice on how to let go of my trust issues from the past?
<bot>: 3 1/2 yr relationship turned LDR, worried about my past trust issues causing me to blow small things out of proportion.