Yes it's a choice in my opinion. We choose our friends, our lovers, and our spouse. Everyone you have ever gotten involved with began with you saying (YES) when the opportunity came to exchange contact information, go out on a date, kiss, go out on addtional dates, have sex, trust and believe what they told you....etc
I don't think it's possible to say (yes) 100 times and then claim that love "just happened" out of the blue! At the very least one has to admit they made a decision to give that person a "chance".
Trust me if you said (NO) to every opportunity to exchange contact information, go out, kiss, have sex, or simply socialize period.... Odds are you are not going to fall in love! Every relationship began with you saying (YES) when you had a (choice) to say (NO).