Confused in love

I’m feeling really really guilty and confused to the point where I’m borderline hating myself over my emotions. I’ve been with my boyfriend for about 6 months now, but his brother and I dated a little bit a year ago up until March. His brother ghosted me 3 different times but our relationship wasn’t that serious it just really hurt my ego and triggered some of my abandonment issues. His brother is more of my type and all of the sudden I’ve been missing him. I don’t want to miss him or feel any type of way towards him but I do and it’s at the point that I’ve been dreaming about him and my heart is hurting. Obviously I can’t tell my boyfriend any of this and I’ve been waiting for it to pass but it’s been 2 weeks and I feel so awful for it. I talk to my friends about it and I’m trying to release it by venting but I feel like it keeps getting worse.