You need to decide it loosing what you have is worth it. Only you can make this decision, nobody else. As an older person, I can tell you that sex isn't the only thing in a relationship. Now at your age it IS a HELL of alot more important than it will be later in life. How are you with dealing with guilt? Seriously, can you compartmentalize and deal with it? If not, then you need to have a sit down with him and talk about including others into the relationship. Are you ok with him having another woman on the side?
You guys need to talk about all this. My impression of things is that he really isn't into this, so be prepared to break up. I"m not saying don't have the talk, there is nothing worse than being in a relationship that isn't fulfilling for both of you, in the end both of you will be happier with someone else. But the best way forward is honesty, because maybe you can deal with the guilt, and maybe he will never find out. Neither of those is a given, and the consequences of both are worse than just getting things out into the open.
As someone else posted above, test the waters first with some IR porn first. See how he reacts, that'll tell you some things. Think about all of this, and his reaction to the IR Porn, and then talk. Go forward from there. Unsolicited Old Man Advice.
Good luck and keep us posted!
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