Love has categories comprising it.
1) Love of the Divine - and this must be exclusive only to Allah (otherwise it is shirk).
2) Love for the Divine - this means to love something for the sake of Allah, or brings you closer to Allah, or Allah has told you to love it. This includes love of the Prophets, scholars, and the rest of the Muslims.
3) Natural love - love for anything that benefits you. We love our spouses and parents. We love good food and comfort. These are all types of natural love.
The first 2 types are spiritual, and the 3rd is worldly.
"You wilt not find any people who believe in Allah and the Last Day and yet they love those who oppose Allah and His Messenger, even though they be their fathers, or their sons, or their brethren, or their kindred. These are they in whose hearts Allah has inscribed true faith and whom He has strengthened with inspiration from Himself. And He will admit them into Gardens through which streams flow. Therein they will abide; Allah is well-pleased with them and they are well-pleased with Him. They are Allah’s party. Surely, it is Allah’s party who are the successful." (Al-Mujaadilah, 58:22)
The muhsin converts his natural love into spiritual love. For example, everyone loves their parents, but a muhsin will use that love to treat their parents the way that Allah loves.
If a person, out of a natural love, falls into disobedience to Allah, then this is a sin. For example, a person may love alcohol and fall into drinking it. This is not shirk.
If anything enters into your love of the Divine, then this is shirk. If a natural love prevents you from love of the Divine, then this is shirk. An example of this is Heraclius not accepting Islam due to his love of his kingdom and power.
To love something like they love Allah is shirk.
And of mankind are some who take (for worship) others besides Allah as rivals (to Allah). They love them as they love Allah. But those who believe, love Allah more (than anything else). If only, those who do wrong could see, when they will see the torment, that all power belongs to Allah and that Allah is Severe in punishment. (2:165)
"Say: If your fathers, your sons, your brothers, your wives, your kindred, the wealth that you have gained, the commerce in which you fear a decline, and the dwellings in which you delight are dearer to you than Allah and His Messenger, and striving hard and fighting in His Cause, then wait until Allah brings about His Decision (torment). And Allah guides not the people who are Al-Fasiqun (the rebellious, disobedient to Allah)." (9:24)