tmi. no picture.

So I'm 8 weeks pp. and my boyfriend and I have been having sex ever since 4 weeks pp (I didn't tear during my birth and I felt I was comfortable enough to go for it) well, last night we did it and afterwards I hurt really bad, and was bleeding, well I took a mirror and looked down there and I have a tear. Like it's a little one but it feels like I have a paper cut every time I pee. My questions are; 1. Why did that happen? he's not that big, not that small (I've had bigger and smaller 😂😂) and 2. How can I soothe the discomfort?