Boyfriend does not understand(?) ...........or prefers you do as he wants?
Not in Budget? Where did the Cig money fit in the budget?
Don't Rationalize and possibly fail again.
You are very unclear on your actual equipment.
1) Ego 650? Do you mean Ego style or Actual Ego Battery? Fixed voltage, unregulated or Variable Voltage?
2) You keep saying BDC? BDC what? Kanger/Aspire - Clone of either? What coil resistances?
3) E-liquid - What Flavor, Pg/Vg Blend, strength?
The lowly Ego 650 and a few cheap top coil clearomizers have saved Many from their impending Fate from smoking.
Many here can recommend other equipment options - everyone has their preference. Some here can actually offer tips/tweaks/corrections or modifications that may help you to enjoy the equipment you already have. The more we understand the more we can help.
Over 2 years since I stopped my 45+yr smoking suicide habit by switching. I have turned vaping into a hobby, but to this day, I still carry and use an Ego (style) 450mah with either a short carto or a small BCC.(Evod/T3-mini/etc.)
Don't give in. Don't give up. In the end the most important thing in your life is YOU!
Note: 12mg is a good working point. Consider your cough could be Ratio(pg/vg), Flavoring or even your body purging the old gunk. Not necessarily the Nic level.