Expressing myself to my boyfriend!

So basically I've had this probably with my boyfriend for the past few weeks. Whenever he does something wrong and I tell him I feel sad, shit etc. he begins to cry and say that he's not 'good enough' or 'you deserve someone better'. For the first few times I was like ok but now I've realised I can't even finish expressing how I feel before he starts crying and saying how he feels shit. And I'm like ??? Why am I lookin after u RN lmao tf