Open Question: my boyfriend takes food to his ex and also escorts her to airport though it was the first time for him to do?

the first time to do it.i feel frustrated because i cook for him and he takes some food to her.he claims they are good friends since they started a business together and she lend him some money for the business while i was still with him which is okey with me though he never told me untill later.i dont understand him any more and i do feel frustrated.am i wrong .for the third time when am not in the house i came back and found her clthes,second was her food and then her cds as though she was watching movies at the house .when i asked him about her coming home when am not there he said that was stupid talking and that he had asked her to bring up his cds though not all belonged to him
he finaly destroyed one of her cd
i am frustratedbecause i feel he treats her better than me and hes always protecting her.am i being jelous