I need help RIGHT NOW

me and my ex went no contact a few months ago on bad terms and i hate them but i also love or loved them and i hate them because they couldnt love me back as i love them

so the thing is like today i just befriended someone new online and they have like a VERY VERY similar typing style to my ex and its like giving me flashbacks and reminding me of my ex and i checked my ex’s profile and theyre matching with someone now and all of this is making me so sad and mad at the same time and i dont know what to do because i thought i got over my ex but just seeing the same typing style as them is making me relapse what do i do please