Why do I have a feeling that I have to choose?

It always feels like i have to choose between my male best friend and my girlfriend in almost every choice nowdays, am a guy, and my best friend has been with me since i was a kid, but my girlfriend am dating since years now and plan to marry now, it feels like my both life are clashing into each other and its getting harder, am so tired of all this

Why do I have a feeling that I have to choose?
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