My husband left me 3 yrs ago for another woman,i tried to save marraige, he said no-finally found someone-now ?

wants to come back, wants to remarry, begging me to not see the new guy that loves me very much, treats me wonderfully. Up to 2 months ago ex said he didnt want to be married, going thru things, etc. He and other woman broke up last year. Says his pride got in the way to want to come back home yet. So I finally did like he said and moved on after tyring to save the marraige thru these 3 years. We were married 25 years- the new guy is a wonderful person and treats me very well. He is a widower of 3 years. I like him a whole lot. My ex is calling, coming by telling me im wrong- he loves me and wants me back..... what do i do? I never cheated on him.. ever