my sister in law says she has a crush on me

My dad has 3 siblings 12 cousins and everybody is very close like we do everything together always. I have a lot of cousins (mostly female) and I was always the only male child in the family (other than my two uncle’s) since I’m the only child. The problem is that I have this cousin she’s a year younger than me and she has a crush on me. She asked me out we did go to the movies last week but I didn’t know how to break up with her. She’s my dad’s sister’s daughter and she said she might have feelings so I said maybe we should just be friends again. <br><br>A few days ago I was moving around home and I listened to her and my family talking but what really got my attention was that my sister in law (her mother) said that she knows me since I was a kid and she always liked me but she never said anything because she’s my aunt by marriage and I’m her son by marriage. My aunt said that she feels like she’s my aunt and stuff but not only that she actually liked me for a while and she said she would be happy if I went out with her daughter my cousin. She went on and on about how she had a crush on me since I was 13 (it’s been 12 years) and she still has and if she wasn’t married and my aunt she would totally go for it. The whole family knows that my sister in law has a crush on me because my cousin told them and we’ve been invited to parties and stuff together as if we’re dating but we’re not we’re just friends but my cousin says we went out together and stuff. I don’t know what to do.