I went through the same thing in late 2019. Fell head over heels for each other and were seeing each other for about 4 months, told me he loved met etc etc and then all of a sudden just after Christmas he called me up crying and said he couldn't do it any more, he needed to be on his own to get over his traumatic break up with his ex. Completely and utterly devastated me as it was so out of the blue and I genuinely thought he was my soulmate.
Had a hard few months trying to get over him, but things do eventually get better and now think actually I am better off without him.
Agreed with yankydoo, no contact is definitely for the best as hard as that sounds. Its really difficult to go from talking to someone constantly to having no contact at all, but if you are still speaking that will give you a false glimmer of hope.
Stay positive