<human>: Could you distill the essence of the text into 1-3 sentences?

I (f21) am a senior in college. My boyfriend (m21) and i were friends in high school but started dating our freshman year of college. We broke up at the beginning of our junior year and since then we've been together but nonexclusive and without a title. We are both now seniors. He used to be so nice. Lately I am convinced he is either using me or hates me. Hes started smoking weed a LOT (like every two hours) and blacksout every weekend. We will make plans but then as soon as I show up he gets irritated and moody and usually within ten minutes asks me to leave, even if we are at my house. He doesn't want to party with me at all lately and I am afraid its because he would rather spend it trying to get other girls. I get it that we dont have to party together every night but we havent at all this year. He will also make plans with me and then not show up. For example last weekend we agreed to go see a movie together and i bought the tickets. I waited for him to pick me up like he said he would but he didnt and so i drove to his apartment thinking he was sleeping only to find him smoking with his roommates. He was furious i had come and told me to get out and find someone else to see the movie with. I went home and cried. Lately he also refuses to have sex. It makes me wonder if Im not attractive to him anymore. When i try and talk to him about this stuff he either ignores me or tells me im crazy and i make stuff up. What should i do?
<bot>: unofficial boyfriend (m21) makes me (f21) feel crazy and refuses to talk about it. What should i do?