Honestly, I agree with you. I'm not even the jealous type but it would make me insecure and awkward too :/
Yep, I absolutely agree too. It is one thing that he is very friendly and open with everybody, but this doesn't mean you don't have boundaries. Every normal person would step back and have a distance with anybody who touched their underwear. But Shizuma? He went with the same person shopping and even touched the hair of her(him). I wish someone would hit on Minato in front of his eyes for him to finally understand what an oblivious idiot he is because honestly speaking, it still doesn't look like he understands what's the problem with his behaviour.
People like Shizuma piss the hell out of me. No backbone, not being able to set boundaries, dismissive of his partner insecurities and jealousy. Then he has the guts of being afraid his current relationship will end like the past one, despite showing no effort to change. Look at me in the eyes and say it would be okay for your partner to have a whole date-afternoon with the person you have warned him you feel insecure about.
NOT TO MENTION, this isn't even the first time someone pursued him and every time Shizuma showed no will to push them away to make his partner feel secure.
Hell na, I had bf like this, throw him in the bin. This behaviour does nothing but devour your self confidence and trust.