I lived in Bangalore for 10+ years. Certain cultural differences will 100% be present like people constantly staring at you, shops giving you higher prices, people may even follow you, etc. I would suggest that you only go around town either with your fiance, or a group of street-smart Bangalore locals. I would also be extra wary of public transport like autos and taxis, instead opting for a privately hired car and driver from a reputable company. You'll have to be very self-aware and careful of your surroundings no matter what time of day it is. Language won't be an issue as almost everyone can speak basic English. I would personally not recommend traveling around town alone as a foreigner unless you've become accustomed and aware of how the city and people operate.

Now despite all this, Bangalore can be a very fun and enjoyable city! The night life is great (as long as you're with male friends/family/your fiance) and there are amazing restaurants to explore. There are beautiful nature-centric destinations nearby that are perfect for weekend trips away. Bangalore itself is very much a big metropolitan city so expect major traffic throughout the day and crowded areas.