<human>: Summarize the given text in a few sentences.

My boyfriend and I began dating in our senior year of college and have been together ever since. The last three years have been rough on us both. He lost a parent and later, his job and I was struggling to support us for nearly a year. Then, when his life started getting better, mine went down the crapper, as I dealt with some pretty serious health issues while simultaneously trying to finish grad school and work at the same time. 

Through it all, our relationship strengthened. We were always there for each other, through all the dark times. Now that we are both in a better place in our lives, we have been discussing marriage. And this is absolutely what I want. I want to spend the rest of my life with him. 

However, over the past three years I have constantly found myself attracted to other men. It used to be my old boss, and for a while it was my brother's friend. And these aren't meaningless infatuations either, I find myself obsessing and fantasize about these men for months on end. 

I usually deal with these emotions by just cutting these people out from my life entirely. Out of sight,out of mind. I even quit my old job so I would not have to be in the presence of my boss. There have been times when I have had the opportunity to act on my feelings, but I never have. And it's always been extremely hard to say no. 

It's not as though my boyfriend and I don't have a good sex life. We do. I've tested the waters on the subject of an open relationship with my boyfriend and he is absolutely against the idea, as monogamy is extremely important to him. 

Anyone else had to deal with this before? Any advice would be greatly appreciated.
<bot>: I don't think I'm cut out for monogamy but my boyfriend is, and I am constantly trying to balance my love for him with my attraction for other men.