he comes back...but he has a girlfriend

last summer I met a guy at a party, and he really hit on me. he was so cute and funny that I called him back after the party and we started hanging out. it lasted about a month, the problem was I planned to move out, to study in another country...I told him the second time we met up. i was affraid he broke up with me but he didn't and all was fine. then he started distancing himself and being quite pretentious...I really suffered from his behaviour bc I felt like I disapointed him...also I learnt he was just cheating on his girlfriend with me...that basically broke my heart and just ruined my leaving.I was so depressed but I tried to think about my studies...until he started to contact me again...but he had a grilfriend(not the same) and texted me like whe was hitting on me ...I dont know what to do with him...I still would like to see him again when I come back in my country but ...idk what to say to him :(