Help I need advice :S

i haven't posted here in a while. By a while I mean last time I posted here I was 14...I am now 18 and a lot has changed but I need some Advice. So im with this guy we have known each other for 4 years we have dated three times and we have been in a relationship for 8 months. I love him to pieces and have had feelings for him for as long as I have known him. When we eventually got together I was over the moon. I am so so happy to be with him but something happened last night and I don't know if I should be worried. I have 3 jobs and one of them is night shift at a supermarket and I was working last night I got told to go home early as they didn't need me it was 1 o'clock in the morning I don't drive and had no way of getting home. My dad wouldn't awnser his phome and my mum is too ill so I phoned my boyfriend. He had been out with his friends till 15 minutes before my call and when I asked him to come get me he said no he was too tierd but he offered no other way of me getting home I didn't have money for a taxi and I have no one else around for me. Eventually I said id get a taxi he said he'd give me the money but today when we got up I was playing on his phone and there was messages from his brother I went into them (we have a mutual agreement that if the other person is in the room we can look at message) and his brother was saying that I shouldn't be relying on him and what not and that that time of the morning is for sleeping not picking me up when I'm stranded on my own and that I should find my own way home which is near impossible because of where we live. I got home safe and sound in the end but my boyfriend never backed me up to his brother C knows he is all I have and I really needed help and he wasn't there is this normal? Am I overreacting? Is his brother right? Any advice awnsers would be ace!!