A person's behaviour tells everything about them, the way they talk to you, the way they treat you, and the way they use you.
Stop yourself from getting used for another person's personal benefits. No matter who they are, or what they mean to you, stop this nonsense and accept the fact that your inner peace is more important.
Not everyone who is there in your life will be there for lifetime, maybe some are there for a reason, and others maybe for a season.
Don't waste your time, learn the lesson from your bad times and move on.