Brother Lover 😩

Okay , so I have this ex ...... And when we were together I always had a crush on his brother BUT i left it alone . We've been broken up for about 2 years but we still see eachother and flirt a lot he tells me he misses me and is still in love with me and still wants to be with me ..... A few weeks ago I saw the brother for the first time in years and we exchanged numbers .... We've been texting just friendly texting .... Last night we all went out to a club both the brothers were there . I danced with my ex the whole night and we flirted a little....... Long story short by the end of the night I was in bed with brother #2 I wasn't drunk .... I knew what I was doing I wanted him . It was the BEST I had ever had in my life !!! But does this make me a slut .... I felt so dirty after . I feel so guilty and bad ..... How should I feel ??? Help 😩😔