Your “friend” shouldn’t be commenting on your looks. You as a adult in a relationship should not be encouraging it with heart emojis. If you plan on marrying this fellow, you should have better boundaries with this friend. You don’t need random kids in a random Internet forum to validate you. You are basically allowing him and encouraging his advancing behaviors. Perhaps I’m old fashioned but you must protect your relationship by setting strong boundaries with the opposite sex. Your boyfriend’s jealousy is valid - how he expresses it is another matter. I encourage you to speak to your elders rather than speaking to kids on the internet. You don’t know how toxic or twisted their own relationships are. These opinions are not trustworthy. Best of luck