He has few friends
The jealous types are usually just suspicious of everyone and burn most bridges in their life, not just romantic ones. If your man doesn’t have many friends, but has many stories about why all his friendships ended, he is probably just not a very trusting or forgiving person in general. And those guys are always jealous partners. They aren’t fans of you going out with others often because, well, they don’t have anybody else to go out with themselves.
After a double date with friends, or just a night out in a group, your guy has something on his mind. He has comments to make about your friends in a relationship: “Joe sure does like attention” or “Does Fran always dress like that?” Jealous men are always critical of other relationships and have the most to say about them. If he’s jealous of other relationships, you can be sure he’ll just be the jealous type, because he shows signs of being insecure.
Pay attention to which of your friends he loves and which he obviously has some issues with. If he doesn’t like your friends who are super social, super liberated and extroverted, it’s probably because he doesn’t want them influencing you to be self-empowered and putting yourself out there too.
Does he always start putting his hands on you when other men are present? You may not notice it as a bad thing because you’re just happy for the affection. However, if he gets noticeably more affectionate in front of other men than at other times, he’s probably trying to exert ownership over you or send a message that didn’t need to be sent.
In general, it’s immature of someone and it shows instability if they are still cursing up a storm about their last relationship. Jealous men do this in particular. Jealous men tend to have nasty breakups because a breakup can never be peaceful when one person was completely paranoid and would never own up to that fact. Instead, they spent a good part of their relationship always blaming the other person for their behavior as the reason things didn’t work out. Men who are secure in themselves (i.e. the non jealous types) just let it go.
He loses his temper easily
Does he lose his temper easily with his family? With servers at a restaurant? With just about everyone except you early on? Eventually, it will be you. Look, every man has insecurities. Every guy gets a little worried when you’re hanging out with a hot guy friend. The difference between them and the jealous types is that they don’t say anything about it. Why? Because they know how to think before they speak. A guy who loses his temper will have no problem eventually saying, “I don’t want you hanging out with __.” Because he can’t hold his tongue.
A sure fire way to make you really like him is to get your parents to like him. The jealous types are used to relationships turning sour, and they want your parents on their side when you’re calling your mom crying about a fight. They want your mom saying, “Oh, but he’s such a good guy!” It’s great for a guy to want to make a good impression on your parents, but you know the difference between being nice and desperately wanting someone’s approval.