I can see that you are sad from this whole thing, but the pain will pass. It might take a while, but it will.

Think of love like water in a stream. You dip your hand in the stream. You don't worry about water that has passed through your hand, or water that is coming down from above. You simply lift your hand and drink.

Live and love in the moment. Don't worry about things past or things to come. You can't really control any of that anyway. Just love the people who are capable of the not always easy task of building healthy loving relationships in the time that you have.