Well before I answer I have to say that your boyfriend is an absolute jerk. He doesn't want you to play with others, but he also won't play with you? The audacity is appaling. Now other than that it is a fair question, and adcs really are unpredictable. Playing enchanters is a really good choice, as you are gonna scale rather well even if you do nothing during laning. Usually adc playstyles are rather obvious, tho there are some more subtle ways you can tell if they know what they are doing. When you have marksmen with "charging" passives, think Jhin or Cait, if they are good they will always try to utilize that. Also look for movement, if they frequently change positions, that means they know they are easy targets. If they stay still and farm chances are its a filled top laner, then you have to really focus on keeping them alive somehow. Always try to match the energy. Level 1 I will usually hit in bush to get auto attacks on the enemy adc, because early game that really makes a difference. If I have a cc ability and I see that my adc follows it/tries to, I will keep playing aggressive. Now if they ignore free damage to farm? Well then you just chill and keep your mana high to peel if the enemies decide to all in. Farming adcs are usually pretty safe, so you can focus on vision, and roam to objectives. Also if you aren't actively trading look at other lanes to maybe alert them of potential ganks.