My boyfriend and I ...need help...so hurt

I want to make us work but lately I feel like a back burner... I don't know how to explain anything because I don't want to make it seem like I want all the attention but I am his girlfriend and I feel like the last to know anything these past two weeks and it's just I over think things and I don't know if that's what I'm doing but I just wanna scream because just the thought of us being apart kills me I don't wanna give up because I really do love him I just want to be the main thing to him I am his girlfriend but lately I feel like I'm not... And now that he's leaving for a week it's not helping matters... Because I know he will barely talk to me while he's gone and then on top of that ... I lay down everything for him everything I change my plans constantly for him and so we can have time together... But like when I want time with him it's like it's only on his time... I don't know how to explain it but I want to tell him and let him know how I feel but it's just I don't wanna mess us up... :( please help...