Why do I feel this way.

Okay this story is kinda long.. well I met this boy thru my brother so he's my brothers friend still actually lol well me and my brother had made this rule that we couldn't date each other friends..and we'll long story short this boy(let's call him Jake ) and I got close ..he would come over to hang out with my brother and sometimes my brother wouldn't be home so he had to wait around till he got home and when that happen me and him started to bond and I started to catch feelings but I knew I couldn't because of what me and my brother had talk about.. so time had passed and one day Jake confess that he was developing feelings and wanted us to try something out ..I told him I couldn't do that because me and my brother had made a rule about dating friends and so on ..well we secretly stating dating for a couple of months or so I thought we were dating but I was totally wrong one day out of nowhere he send me message telling how he had found SOMEONE and pretty much thank me for being there for him and ugh I felt so horrible but I knew I couldn't tell anyone because no one knew about us ..and so fast forward to now ...he and the girl didn't work out and he started trying to talk to me again which I was like "OH HELL NAH" about it ...so anyway I came to ask is it wrong for me to lied and tell him I have someone now or lie about being with a guy .. he call me a couple of minutes ago asking for my "brother" but the whole time was asking me what I was doing ..who I was with and such ..well I lied and said I was with a friend and he ask a girl friend or a guy friend I was like that doesn't matter he then ask me if I can give him a ride somewhere I told him again I was with a friend he's like can I go by, is she cute .I was like "Yea HE'S CUTE" and he said ohhh he's cute so it's a dude I was like yeah whyy.. he's like what u guys doing i was like nothing just chilling .. Netflix and chilling 🤣😂 and his mood totally change and was like oh alright I'll talk to soon or give me call when ur free but really call me and I was oh alright I'll see .. and hang up but Girls I was just lying I was at home the whole time laying in bed by myself🤣🤣🤣🤣 but now I feel horrible for lying