to be or not to be?

Me and my boyfriend have been going out for 4 months now its a really hard relationship because its long distance but I am trying my hardest to make it work I know this may seem very obssesive but we txt all day long and when he doesnt txt me I tend to get a little pissed I know I shouldnt at first he alwyas made me feel very very lucky and loved and happy and we have the kind of relationship where I can go crazy on him when im pmsing and he is totaly understanding but lately he has been makeing me feel upset and pissed off at him then more then he has been makeing me happy he sometimes makes me feel like he doesnt really have feelings for me but when I ask him he says he does I dont want to ask him a lot because that would make meseem needy but I dont know what to do if this makes any sence your advice would be great