Is it mid-life crisis or is it betrayal? Wat am i supposed to do?

Hez 38 separated & i am 32 separated too.We have a long distance relation & meet 1ce in 2-3 months for 5 days. He came to me wen he was goin thru a realy rough patch 2 years back & since then we have been in intense love. Things changed sharply since last 5 months, wen he started communicating & making friends with young girls & inspite of my request didn't end them. We even went out for holidays n he ured that he will finish them but still he didn't. Every second day i find out smthng or the other that he is doing on net, smtimes i fight, smtimes i make him understand but nothing seems to work. He says he loves me & i trust him. He also knows that I love him but he just doesn't care to realise wat i am going thru. And he blames everything on me that I showed him the way to all this. He is in lot of stress becoz of his divorce proceedings. I am going thru hell yet I dont want to lose him but my patience is giving up gradually. Need genuine advise as to wat shud i do? Plz hel