Im very confused about my feelings... please HELP! :(?

Me and my boyfriend have been going out nearly a year now... well a year this thursday... and we have been through a lot and have split up many times before. we split up last night cos im a very bad worrier and i worry about everything we do even though its nothing sexual and also because im always very confused with my feelings and i just dont want to do the wrongg thing by maybe staying with him if im not sure but now im very down and want to be with him but something doesnt feel right when i think of us being together. Im 15 and he is 17. Now we have split up, this time it feels so real and i have been confused about my feelings for a long time :( and i still don't know whether to try and make things up with him or call it a day... maybe it would be best... i just don't know. i just need to make a desision but because im so confused i really dont know what to do :( if any one can help me i would be very grateful.. thanks :)