my boyfriend (m23) thinks I (f22) have a drinking problem.

I did have a bit of a problem when I was younger (dumb high schooler /pure pressure shit) but now I think I'm fine. Have I been drinking every day for the past 2 week -yes- but it's not that bad. I don't even get drunk I just mostly get tipsy at most. And it's not like I'm going to drive (I don't have a car) so I don't get why he's so upset with this. It's not like I'm underage anymore. And I can stop whenever I want to. I'm not addicted to it, but he thinks I am. And also I don't even get hungover when I drink so I feel fine the next day. I feel so nice when I drink I'm finally relaxed for once and I feel happy. We had an argument earlier today about it and told me that "it's becoming a problem because I'm going to get a tolerance and drink more and more and eventually get drunk every night and then die because of it. And I need to stop because I can become an alcoholic because of my PTSD and wanting to stop feeling like crap" and it pissed me off because I haven't really had an issue with my PTSD for awhile and now that I'm drinking I feel fine I feel even better before I started drinking. And not to mention I can stop anytime like I said but I just don't want to because I feel happy I feel like I deserve to be happy and I am happy with him but I'm even more happy and relaxed when I'm drinking. And when I'm "drunk" I don't even get mad or violent I just get loud and have no filter but it also depends on how many drinks I have because the most I've had is 9 and I started speaking Spanish which I barely even know but for some reason drunk me speaks it fluently.any way i just don't see why he's so upset about it. I'm completely fine and I can stop whenever I want. He doesn't really seem that upset about it but he does want to talk about this with me all the time and it can get kinda annoying. Anyway sorry this got a little longer than I thought. I am a little upset about it and I also did just take a shot before this so if misspelled anything I'm sorry. Tldr: I've been getting tipsy every night for the past 2 weeks and my boyfriend is not happy about it and he wants to talk about it with me all the time.