I want to know why he act like this?

He sent me a message on instagram because he knew we were in the same university. We dated for 1 week then he said "you're my girlfriend now, i told my friends and my sister.". But I found this strange and refused his meeting offer all the time. He was nice, polite and caring to me all the time we talked. After a month he sent me a long voice message (10 minutes) and he told me "you broke my heart, i feel sad because i love you, i care about you, im trying to meet but you don't want to meet me. I think you dont love me." etc. I accept meeting offer and we met twice in 2 months. He always treated me respectfully and well. We never had sexual things just innocent kisses. He dreamed of a future with me, he told me everything, he wanted to introduce me to his friends, he made me a playlist, he drove me home, he always just talked to me (He may have talked to other girls during the day because I was only text him in the evening) and he always helped me. But he decided to go his hometown for 2 months (his hometown is in the same country). We texted in the morning, but in the evening he told me that "someone close to me died, I can't be like before, we do not talk anymore look at other men for your good." . Now do you think his excuse is true? Or did he not like me and was just hanging out with me?
I want to know why he act like this?
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