Do you think it’s stupid to give yourself fully to your partner?

When I get into a relationship with a girl that is choosing me like I am choosing her , and we are both on the same page as things , Do you think it’s stupid to fully give yourself to her , or should you back up some and keep yourself safe from heart break? I always hear people say to not give yourself fully to your partner because they will eventually take advantage of you and break your heart. I always hear guys’ saying things like this , basically implying once a girl knows you aren’t going anywhere , she will get bored of you and end up leaving you or cheating on you. So if that’s the case? , then what’s even the point of being in relationships , if that’s eventually going to happen? From my experiences in relationships through the years , I give my heart fully to her if she is giving her heart fully to me , Making her my top priority hoping she is doing the same for me. But some of those girls’ ended up breaking my heart or cheating on me when they knew I loved them with all my heart , so when I hear other guys’ saying things like this , I tend to believe them nowadays because it’s happened to me a few times before. When I didn’t give my heart fully to a girl , it seems she chases me more because I am now harder to get , , so is that the trick of keeping a girl in a long term relationship? By not fully giving yourself to her? It makes no sense to me. Why I am no longer rushing into relationships with girls’ because of shit like this
Do you think it’s stupid to give yourself fully to your partner?
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