Is it weird that i still use my exs underwear to jerk off?

I dated my girlfriend for about 4 years we didnt live together but we were together all the time. She knew i liked jerking off with her underwear and would let me keep a couple pairs all the time. She thought it was hot i was never a sock guy lube occasionally but it gets messy. I use to hump my girls ass in a soft pair of underwear all the time it felt great and right as i would cum shed lift the side and let me slide my dick in her crack to catch my nut so it wouldnt shoot everywhere. I was horny one night and had some of her underwear in my sock drawer so i said you know what wrapped em around my dick it felt amazing tickled the head a little bit part hung down and rubbed against my balls and it was easy clean up ball them up and toss them in the laundry theyre good as new after a wash lol i sent her a few videos of me doing it she loved it so i didnt feel bad. Now were broken up its been about 3 weeks and i still use them not much thought of her i mean its hot knowing theyre her underwear but it really just feels good. I told her i had a few of her things and named them her undies included even went as far as to tell her which ones they were she said keep them lol so i did even jerked off with them right after is this normal anyone been there? Of course i still love her and miss her shes hot af and had a huge bubble butt i only wish i had a dirty pair lol just couldnt get myself to throw them out if i meet someone of course i would but as for now no one is really going out im home more and horny so why not lol.