Relationship help

For starters I’ve been dating my boyfriend for almost 4 years and we don’t really go on dates due to our busy schedule and our alone time usually consist of watching a movie and we don’t even talk or have a conversation because we’re watching a movie and I’ve been lost on what other fun cheap easy things we could do. Second our sex life kinda sucks, we both still live with our parents and being intimate is hard with our parents being nosy or siblings being annoying and it’s hard to really be intimate and enjoy our self and take our time without being nervous someone’s going to walk in, what do I do. Third, I miss the little things he used to do like holding my hand or grabbing me from behind or bringing me flowers or grabbing me and telling me I’m beautiful don’t get me wrong he still does these things just on a very rare occasion. Finally I noticed he follows these accounts on instagram of like half naked chicks or there’s been incidents where he’s following a girl he Doesn’t even know and likes her pics when she’s in a bikini but can’t even like my picture of a simple selfie, are these all signs that he’s loosing interest and getting bored with me? After 4 years I know a lot of things change and we adjust to each other and I’m really needing help on how to freshen up our relationship or if these are signs that I need to move on. Please tell me what your opinion is.