9 Signs a Guy Is a Keeper.

We asked relationship experts to help singles spot the clues that indicate a serious boyfriend and beyond potential. Here's what to look for when separating the princes from the toads.

Keeper clue: He has his act together.

This seems like a no-brainer, but it's a good place to start. "You two must be able to have a lot of fun together, so a party boy or a screw-up will probably not work out for you, a family and couples therapist, and author of Is He Mr. Right? "No matter how charming he is, if he is still struggling to grow up, it will get ancient, very fast."

Keeper clue: He puts you first.

Picture a delicious platter of grilled steak. Does your partner offer it to you first to let you pick the best piece? He does if he's a keeper! "When it comes to taking the best piece of meat or offering it to you, that's a metaphor for how he'd always put you first the rest of your life," s

Keeper clue: He's not afraid of your germs.

You know a guy is really into you when he can't stay away, even when you're bedridden and snotty. "When you're sick with the flu, he says, 'Let me come over and take care of you,' rather than, 'Oooh, you sound really contagious... call me when you're feeling better.

Keeper clue: He's a family man.

He asks about your family, and he seems genuinely interested in hearing about them. "Interest in your family shows that he thinks about you as a whole person, and he knows that being with you means understanding and accepting your relatives too.

Keeper clue: He makes time for your friends.

At the beginning of your relationship, does your partner show an interest in meeting your best friends? And does he follow it up with a plan, like hosting a low-key dinner party? "Friends are an essential part of your life, and his knowing them makes him more involved with you. Plus, he'll have to deal with them at some point, so initiating it himself shows maturity?

Keeper clue: He's your biggest cheerleader.

When your guy calls your mom to tell her about your promotion before you do, that should tell you something. A man who is supportive of you and your goals is typically a guy who doesn't "feel threatened by your success. "He knows who he is and where he's going," which means he can ultimately be there for you.

Keeper clue: He remembers the little things.

Does your man listen to you? You'll know he's a keeper if you tell him you have a big, scary work meeting, and the next time you talk, he asks how it went. Or if you tell him you left your sunglasses at his house, and he remembers them on your next date. "Following up on things you say to him means he pays attention to you - always a good sign if you ask for my suggestion.

Keeper clue: He's happy when you're happy.

This is the guy who "goes to a chick flick with you on Friday night rather than an action film - not because he wants to, but because it makes you happy and excited.

Keeper clue: He makes you the best you can be.

A guy who makes you feel like the luckiest woman alive - like you can (and should!) be your confident, fabulous self - is worth hanging on to. "It's not just about how you feel about him, but more about how he makes you think about yourself.