Yeah i know how you feel, i was asking my therapist a very similar question. He expressed to me, that love, and a relationship, a well maintained relationship can honestly be a huge encouragement and a reason to live yes, but he compared it to table of legs. Its like you have a table, and that's your life and each leg of a table is a reason to live. And when one leg breaks the other legs will be able to support you. The thing that is hard when you're suicidal and in a relationship, like myself, is that you put all of your will to live on that one leg. And ofcourse it can be something, something but because of the pressure on that one leg, you could be very very stressed of what happens when any arguments and clashes happen, you'll be terrified they will leave, and your one and only leg will break. But that doesn't mean you can't be in love and love someone while learning to love yourself. That's a myth that you can only love when you come to yourself. But unless you try to actively learn to take care of your self you might hurt the person you love.
I know this in my own personal experience. I love someone, but i know he's my only thread of will to live. So i decided that i wanted to get more leg tables to to speak to be able to love him better. I know it's tough, so the answer is yes i think so, just with some conditions almost.