Thanks for the reply. I know that I'm in love with the girl, and I know that I can't possibly picture her with anyone else without getting sick to my stomach. I feel like I want to be with her, but I also realize the potential for me to be single and enjoy my mid-20s.
I do sometimes think of sex with other women when I'm in a relationship and I am ashamed to say that I have not been faithful in the relationships I've been in.
I do sometimes feel as if I get bored, but I know that when we break up, I realize I took for granted what I had and it always makes me want her more then ever. I feel like the solution might have to do with me finding ways to spice up a relationship that goes dull either in a sexual way or just a day-to-day way. Please help because I know with my current situation, I do feel as if she might be the one for me, but I want to make sure I will always be as sexual attracted to her and as sexually active as the first few months we knew eachother.