Is it right to open your heart to someone even though....

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Good evening/ Good morning! So one of the greatest songwriters and one of the most popular singers here in the Philippines released a new song titled "PAUBAYA". It is a point of view of a person who loves someone that is still in love with his/her past. I read some of the comments there and it is sad that there are people who let someone love them even though they still love someone else. In your opinion, is it okay to open your heart to someone even though still love someone from your past? Is it okay to let someone hug you even though your heart is not on them?