Cheating .

I’ve been with him for 2 years we have been living together, honestly when we first got together he did text this female . After a while of being together and living together I thought everything was great , but I noticed she had been unblocked , come to find out they had been messaging . He told her “ I have always had a thing for you “ . I was leaving but he begged me too stay and cried to me , it’s been a couple of days , something I cannot forget , because it had been with the same girl he had spoken too before .. and I can’t sleep at night , I don’t know how to deal with this .. I don’t know . He has never even meet this girl and she’s is know to home wreak so many peoples relationships. & he’s being stupid to try anything like that ..