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It is wrong to stick to people for the only reason not to be lonely. One can never know what the other person feels. So they might love you from the bottom of their heart, while you are just passing time. And you are not even enjoying it. Instead you would feel depressed about the whole situation and with this you would pull down the other person too. As you try to explain them everything, they just don't believe you. They can't imagine the person they love so much doesn't have the same feelings. Not after all this time.
As they would get pulled down you will start to fight. But at the climax of the fight it is you who calms the other person again. You who start to lower your voice first. Not them. And at THIS point you won't leave. In this very special moment you stick to them. You will endure everything and want to stay around them no matter what. In this moment, thinking about life without them just doesn't make any sense. And you know even if you'd turn off your phone or stop talking to them, they would crawl back to you. You know it so well. But you never let it happen before. Because it is always you who does it first. That doesn't make them a bad person, 'cause they don't even have the time to do it first. Because you do.
Now one could say that exactly this is love. Not leaving in bad situations. Don't want to lose them when they don't deserve you. That's what you used to believe too. Not anymore.
Yes it might be true that after a while the passion will fade away. But that's one thing... It is something totally different if you feel constant unhappiness with the person you are together with and just feel the urge of staying when you fear to lose them. That is not love. That has nothing to do with it. It is just an egoistic way not to be lonely for a while.
Leave. Do it.
There are bad times in relationships and it IS weak to leave in those times. Unfair and weak. But this is not a bad time. The bad times lie far behind you already. You overcame many big problems and difficulties. Now that the other person is not depressed and everything is ok but you still feel unhappy, you should go. For the sake of the two of you.