Help , my mates leave me ouuttt?!!?

wel , i go skating alot , and they always skate of without mee ,we went in the town and both ditched me to go to another shop and didnt tell me .. one was my bestfriend and really liked me , then i got a new friend and my old friend felt jelous so became mates with her, .... what should i do to get my new mate bacckk!!!!!!!!!!!!!!!!!