SO so rude!

So lately my SO has been so rude towards me I have no Idea why he hasn't been stressed out or under alot of pressure. Like last night he said he was going to his friends house and I said ok cool what time are u going and he got so defensive he said damn don't start with your bull shit and I got so confused because I didn't say it with an additiude I was just asking out of curiosity we live together and I would like to know eventually he didn't end up going out because he said he didn't wana hear my bulshit mind you I havnt said anything bad all I did was ask what time and this isn't the first time he's been so rude I'm not sure what to do I've just been ignoring him all day but it's hard to ignore when you live with him and you have no car to go out