Wait or leave?

My (29f) boyfriend (29m) and I have been together for almost 2 and a half years and have lived together for two years. When we met we both immediately knew that this was it and we both found The One, and it’s also why we moved in together so quickly. It was all his idea and I just accepted it, thinking nothing more than he wants me to live with him because he loves me. We talked about marriage and kids pretty early on and he said he wants to enjoy the rest of his 20’s and get married after 30. Fair enough. However, as you can see, we’re 29, and his 30th birthday is in two weeks, yet there’s no proposal in sight. He’s financially stable, has a great job, we live in a great city and are quite comfortable with our living situation, I don’t understand the arbitrary restriction of waiting until after 30 especially when we’ve already been living together for two years. How much more proof does he need? It seems like an excuse to me to see if he can find anything better while stringing me along, why dump me if I do all the housework, cook, and give him head massages frequently. Why buy the milk if you can get the cow for free, right? :( and whenever I try to ask him if we’re still on the same page and if he still wants to get married, he gets mad at me and he hates it when I bring it up. I don’t know what to do. Obviously I’m not going to break up with him now because technically he’s not 30 yet, but I don’t know how long I should wait for a proposal after he turns 30. Wanting to get married after 30 can mean anything from 6 months after he turns 30 to a day before he turns 40. I’m also really triggered by men wasting my time because in my last relationship, we were together for 5 years and engaged for two before I left because he was clearly stalling. But now he’s married to someone else and I’m still begging a boyfriend for a ring so I’m clearly the problem :(

Edit: I forgot to mention the best part. To rub salt into the wound, his sister is skipping engagement and just straight up getting married to her boyfriend after just a year of being in a relationship. Or even less than a year. I’m obviously very happy for her and I love her like my own sister and can’t wait to attend her wedding party, but I haven’t stopped crying since I found out a few hours ago. When she told her boyfriend that she needs commitment, he went for a walk in the park for an hour to think about it, and agreed. That’s it. It took him an hour to decide he wants to marry her and now he’s actually doing it. Why won’t my boyfriend??? We’ve been together longer. We live together. How much more convincing does he need??? I don’t understand :(