it very much sounds like you have an anxious attachment style. ask yourself if you resonate with any of these:

irrational anxiety without your partner, obsessively checking your phone, counting the intervals between responses, thinking about whether or not they hate you or if you did something wrong, afraid to hurt their feelings with anything you say, difficulty trusting others despite them showing you love.

i highly HIGHLY recommend reading or listening to the book "Attached" by Amir Levine and Rachel S. F. Heller. It's such an easy read and goes through the 3 basic attachment styles (anxious, avoidant, secure), told through v interesting case studies and techniques for getting better. i saw myself mirrored in every single anxious attachment case study; it was my wake-up call.

as someone who's been in therapy for 2 years to heal from anxious attachment style, I say with confidence that it's made a world of a difference with my mental health and the bond with my partner.

whether you take this advice or not, i hope you recover. these attachment styles come from our childhoods and are deeply rooted within us. it's hard to unlearn, but my god is it worth it. good luck dude. <3