Welcome, Music.
If you offered a youngster a piece of chocolate cake and he took it, then you had a cake sitting on the counter and said he was welcome to it, then kept your doors open and told him he was always invited....would it be that he used you for the cake, or he just took what was made available?
I know people who are takers, do use others. Not ok. But sometimes we, in our desire to be loving and helpful, offer too much and then later feel taken advantage of.
People cannot take without our permission.
I'm sorry you're hurting. It really sucks.