I started seein a lad for about 2 months...?

...and i went to work abroad for the summer, i came back to find he was seein his ex gf again so i jst left it. but then he txt me a few weeks later to see how i was and he asked if i wanted to meet but a few weeks later i met up wiv him and then a week after that i found out that his ex gf was goin physco saying he had only finish with her the other day, he ses to me she is makin all this rubbish cus she cant get over him cos shes jealous that hes moved on, that he is meeting other ppl. WHAT SHOULD I DO? SHOULD I LEAVE IT? SHOULD I GIVE HIM A CHANCE? PLEASE LET ME KNOW...thank u x