Did he do anything with them girls

hi every1, can any1 help me ive been with my boyfriend for 2 years now but when we first got 2gether he was always out with his m8 n his m8s girlfriend n her m8s we had a chat n i asked him if anything went on with any of them girls he said no all he did was danced with 1 of them but he always left me n went 2 see his m8 n girlfriend at her house. i juat cant get it out of my head why coose 2 b with them then me am i being silly?