Will Jane ever find Red John oder will the Zeigen end before he does and will he ever remarry in the Zeigen oder would that make him too happy and he would lose focus on Red John?

I think Jane will catch and - probably - kill RJ.
I also think he won't remarry, but he'll be able to say Lisbon "I Liebe you" before the end.

His entire purpose for being with CBI is that he wants revenge. I think that if he's going to catch him it'll be at the series finale, and I don't think he will get with anyone else until then, too, because he can't Bewegen on until Bosco-excuse me, Red John, is dead.

I don't rlly know if Jane will ever remarry, but my personal guess is that he won't do so until he catches red John. Like, dating is fine, but if he remarries, he'll always have that fear of 'messing up' and red John killing his Sekunde wife.
So no. I think he'll try to catch red John before he even tries to remarry.