I hope you are fine thanks in advance for your help. Me (35 years old) and my boyfriend (41 years old) have been dating for 1 year in a long distance relation. However I have an older sister that tries to get his attention, and she is kind of flirting with him. Recently he came to visit me and he was so excited to meet my sister again. He could not stop looking at her, at her body and with a big smile and lots of attention when she talked to him. I talked to him and said that I do not like the way he acts with her. Thus, I ask him to think about it, to take his time, to stop our relation and then see what he really wanted. He said that he do not want to break up, because we have built so many things together and that he has that superficial experience with his previous beautiful girlfriend, and is not what he wants. However, he said, "is just that you and your sister, are so similar in appearance, and she is very attractive". I do not know what to do, because it is a chaotic situation while he is at my parent´s home I want him to act freely.
Can you give me your advice please?