He Hasn't Done Anything Wrong
One the one hand, there is no reason to dump your boyfriend on the grounds of committing a love crime, since he hasn't done anything wrong.
However, he may be dealing with lots of issues surrounding his marriage and not ready to enter into another serious relationship.
So, it's up to you.
If you are like me and you think that immediate gratification takes too long, this could be an excruciating three years. In fact, it would be an excruciating two months, because you'd want to get out by then.
If you're like some of my friends, you can relax, kick back and wait to see what happens.
In either case, since neither of you has made a commitment to the relationship, why not meet other people? It will give you both a chance to have some other experiences and find out what you want.
Also, you may want to set a time limit for making a commitment - let's say, one year.
When the year is up, be ready to end the relationship if it hasn't moved to where you want.