My significant other is on antidepressants and I wish he would stop using them.
If he is on antidepressants, then he clearly needs them. How can you not want your significant other to take his medication?
I heard that some antidepressants can cause heart attacks.
I appreciate that your motivation is good because you are concerned about his wellbeing, but you need to let him take his medicine. If you are that concerned about the side effects of the medication, I'm sure you can talk to him about it and him and his doctor can discuss the potential side effects.
I just want him to be ok.
It's sweet of you to be so concerned about him, but if he stops taking his medication then his depression will worsen. I'm sure his doctor is well qualified and wouldn't give him the antidepressants if the side effects would be bad.