I miss my ex and want to contact him.

Me and my ex broke up about a few weeks ago due to us just constantly arguing and not working anymore no matter how much we tried. I constantly see him at school but today had hit me really hard I really miss him today. But life has actually been really nice ever since our break up it has been refreshing no stress and i’ve been able to work more on my goals and my self but now its just hitting me hard. I don’t know if i should text him or not because yes I miss him but we just could not work.