Ok if your fighting a righty keep circling away from his right hand, therefore i beleive, youre circling left. When he throws that jab you can hit the top of his head with a straight, or overhand right you may have to slip the jab inward to land perfectly but if well positon you can get him by slipping it outside as well. when he throws that right hand you can duck while jabing to the stomach, idealy to the ribs right below the pit of right arm, but you got to know that 2 punch is coming. If you slip the jab to the outside and are pretty fast you can counter the jab with right hand and while keeping the front foot in place swiveling the back foot foward so that you are trying to pivot and get behind him and throw a nast left hook to head or body. This has to be well planned and hes either has to be slow with that 2 punch or you've got to be fast!

My Favorite....

Get close to him and encourage him to throw that 1-2.....let him.....you want him to!
Keep those hands up high and react!!

when he throws the jab slap it down or to the side and fire a quick right all in one motion.

When he throws the right when it hits your jab hand slap it down and fire a double jab and right...hell add in a left hook and let him know your not fucking around

When I say react I mean whatever hand he hits you've to be prepared to slap it down with that hand and fire that same hand

It wont work it hes throwing a right hand to your jab hand and you slap it down with your right hand so it takes practice.