What if YOU find out that the one U really love turns to be yer enemy or somehow betray U ?

there is a guy i really love , we used to be together for a while and all the pple around me were advicing me that he isnt the right guy for me but i used to ignore them all. he was married to a woman n his wife left him because he got cought while having with another woman ,well , i used to ignore his past as well , i neva gave a **** to pple's **** talking behind him but recently ive heard that he had somebody else except me , but in other hands he asked me for marriage n stuff , am really confused , there is a huge age difference between us n i dont want to make a big mistake in my life n fell forever !! help