My boyfriends grandmother doesnt have boundrys / gramma's boy

My boyfriend is in the army and we see each other every few months. He also sees his family that often. He was living with his grandmother before he left for the army. Whenever he comes home he stays at his grandmothers. His dad and sister spend most of their time there too when hes home, wich is great. I also stay over there when hes home. They all welcome me as family as we have been together 5 years. We do go out and spend time alone or with friends while hes in town but I basically live there so that he can spend as much time possible with me and his family at the same time. I sleep in his room.
His grandmother loves me and I love her too but my problem is that she's kinda clingy and needy towards him. I understand since she is a widow, but It still bugs me. I mean She has a son of her own (his dad) too. These are all the things that bugged me during the last visit: In the morning she always peeks her head in the bedroom doorway where were sleeping to tell us breakfast is ready. That perfect of her to want to make breakfast but she does not need to see us laying down cuddling. We are both in our early to mid twenty's and hardly see each other. Last time he was home his other family members and I were hanging out in the living room while he was in the bathroom taking a poop. She peeked her head in the bathroom doorway to speak with him for a moment. That really aggravated me. That is the kinda thing I don't care for my mom or grandmother to do and we are the same sex. My Boyfriend is is a grown man now, but didn't seem to care. Another thing that happened last time; My boyfriend and I had retired to his room for the night. We started to fool around a bit. I said I wanted to go brush my teeth before we got to into things. I just really needed to brush them quickly before sex/making out. i was feeling kinda gross since i hadn't since morning. When I came back he was like "brb I'm gonna go tell mamaw goodnight" so he went to go give her a hug and kiss on the cheek i guess in her room. I told him "way to ruin sexy time" or something lame like that. And he said I did it too when i went to brush my teeth. I don't feel like those are equal. He had already told everyone goodnight. There's no reason to feel the need to see your grandmother at that moment.
The evening before my bf was going to head back to base it was dawning on everyone that our time together was running out, me and my bf were sitting on the couch together and she rushed out in her untied robe, tee shirt and pantys to hug us. she was bawling and almost having a panic attack. She just seemed so desperate. I feel like her not being fully dressed was kinda for attention so we knew how she didn't care about anything else, or something. She could have got it together enough to tie her robe up. My bf and I hugged her together and i was rubbing her back for a minute till she calmed down. I felt baddly for her but he's been in the military for 4 years now, almost done. He wasn't leaving for deployment just going to the base in another state. I feel like she should be more used to this by now and should let him grow up. When finishes his military time its not like he is gonna live with her. A while back my boyfriend once asked if she could live with us in the future. I nipped that idea in the bud though and he dropped it.
I know all of this might sound bitchy on my part, but is it normal that this stuff gets on my nerves so much? I just feel like she lets depends on him too much for her own happiness. Or is there something wrong with me were I cant handle this family's closeness?

Writing this and reading it are helping me to analyze it better. Maybe she is trying to replace her late husband with her grandson in a way. And she cant take him leaving. I guess I have to get over my being annoyed. ...Still kinda feel like she should work on not acting like that though. What do you think?