How do I know if it’s my partners depression ending our relationship or him? He said he doesn’t feel in love anymore but wants to be in love with me.

I know this can be a confusing time for you. Especially if your partner is expressing this to you now during their depression. Depending on how long he has been depressed, he could have felt this way before or during his depression. Depression can sometimes make the non-depressed partner feel helpless and confused at times. If you feel that both of you are willing to make the relationship work but sort of feel stuck on knowing how to keep moving forward, you may want to seek advice from attending couples therapy. Also, if you would like to support your partner with their depression, you could also seek a consult from a mental heath professional to get a better insight on your partner's depression.