Does anyone still feel feelings when they see their ex?

I went to an event yesterday and my boyfriend of one year wasn’t there. And my ex was, he looked so handsome and I immediately started to feel everything back . P.S I was the one who broke up with my ex because I felt like he was a freakin brick wall never showed me love like I wanted but we’ve broken up twice and on the second time we were together he really tried to change but he was still mean and showed little emotion. So now I’m with my bf fr a year now and he does show me so much love , and I do love him but after seeing my ex last night I feel wierd....does anyone feel “feelings” after seeing their ex?

And please tell me it goes away.

Because my bf is better by far but I still have feelings after seeing him.

Has anyone experienced such thing?

Also my ex was my first for 1st,2nd and 3rd base. So.. please share advice or experience