<human>: Using a throwaway (despite that there's nothing incriminating or that I need to hide this post). 

As the title suggests, my boyfriend of about two years (I know, we're young and naive, but still in love) wants to open up our relationship. In the past he has always been a very jealous person, maybe to the extreme, and I can understand, I've definitely become very protective of him since we've moved in together a few months ago. Now though, which came as a surprise to me, he said he wants to experience the excitement that comes with being with other people. I wasn't too thrilled at first, but I don't want to lose him and I'm willing to give this a shot. 

We are a very honest and open couple, communication is HUGE in our relationship and I love that we can tell each other anything, but this just caught me so off guard. I'd love to hear advice about any similar situations or anything to expect. I fear the worst case scenarios, me becoming too jealous, him falling for someone else, not following the guidelines we have set for ourselves, etc. I'm happy to answer any questions about the rules we've set up for each other (a lot on the lines of protection, never meeting up with the same person twice, what we can and can't do to another person etc). 

He's the only guy I've ever had sex with, while he has been with other girls before, so while it's scary to think about me being with other men the curiousity and excitement is very arousing. 

I guess I just want to know what to expect, and I understand every relationship is different, but I really want to make the most of this new chapter in our relationship because we really care about each other, and I hope that this can really strengthen our friendship and romantic relationship. 

All advice (or criticism) is welcome, but I'd really like to hear other people's experiences too and I want to know whether opening your relationships was a good or bad idea.

Can you condense the text into a few key points?
<bot>: me and my boyfriend of two years are entering into an open relationship, in need of advice and what to be prepared for!