This week we have a man with a female best friend, but his girlfriend is getting jealous.

Some people have problems that require delicate advice from a qualified professional. Others just need a random a guy on the internet to kick 'em in the teeth (with honesty, that is). I'm the latter. Welcome back to Tough Love.

Some people have problems that require delicate advice from a qualified professional. Others just need a random a guy on the internet to kick 'em in the teeth (with honesty, that is). I'm the latter. Welcome back to Tough Love.

What is love (baby don't hurt me)? It's a tough question to answer and people have been asking it since the dawn of civilisation. Perhaps the best way to identify love is to learn what it's not. This beyond-hokey instructional video from 1950 actually helps draw a clearer line between love and infatuation.

You have problems, I have advice. This advice isn't sugar-coated - in fact, it's sugar-free, and may even be a little bitter. Welcome to Tough Love.

Love is a complex and powerful force, one that plays out in a number of emotional, cognitive and social ways. According to the late psychologist John Alan Lee, there are six broad styles of love: Agape, Ludus, Storge, Eros, Mania and Pragma. We look at each in turn to help you determine the type of lover you are and the type of lover you need.

In this week's episode, we're talking about heartbreak. How do you know when your heart is broken? What can you do about it? And how do you help the heartbroken people in your life? Our expert guest is Guy Winch, noted TED speaker and author of the forthcoming book How to Fix a Broken Heart.

This graduation speech by Australian comedian and Groundhog Day composer Tim Minchin contains a bit of advice that I've certainly heard elsewhere, but seems especially useful at a time when we're all exhausted by the constant pressure to assert our identity on social media.

If you've been on the dating scene for what feels like forever and you're starting to feel frustrated and disillusioned with it all, it might be time to take a step back and do a little re-calibrating. We project how we feel to others; people can sense your negative outlook from a mile away, which ruins any chance of things working out. It seems counter-intuitive, but the more you act like things are never going to work out, the longer you'll probably be alone.

You have problems, I have advice. This advice isn't sugar-coated - in fact, it's sugar-free, and may even be a little bitter. Welcome to Tough Love.

You've got problems, I've got advice. This advice isn't sugar-coated -- in fact, it's sugar-free, and may even be a little bitter. Welcome to Tough Love.

Most of us make resolutions to improve only ourselves: We vow to cut out sugar, work out three days a week, dust off the resume and start the job hunt for real. In general, resolutions tend to be very me-focused -- willpower, weight loss, self-care.

It seems the "summer fling" is a real thing. According to data from the online dating service OkCupid, now's the time most people are looking for one-night stands.

The dating app swipe can be addictive and satisfying, but it also rests on snap judgements that aren't necessarily the things that make a relationship work, such as common interests and a shared worldview.

Ever since that first "Dear John" letter was delivered by carrier pigeon, breakups have sucked, but social media makes them suck harder. Even if you block, hide and unfriend, you can still be attacked by an unexpected photo of your ex posted on the accounts of mutual friends. Rather than be the victim of such virtual hostility, you should harness the power of social media to fight back, and prove to everyone that you are doing just fine, thanks.

Dear Lovehacker, I've been living with my boyfriend for over a year now. Everything had been great until these past few weeks. He's been distant and preoccupied, not answering my calls, taking hours to get back to me, coming home late, and so on. Last week after I worked the graveyard shift, I came home and found sex toys in the shower (dildos). He said he used it on himself...

Video: Nearly everyone has had run-ins with infidelity at some point, whether you were the guilt-ridden cheater, the devastated cheat-ee, or the unwitting (hopefully) third party in someone else's affair. (And if none of these things has ever happened to you, well, must be nice!)

Video: In the first instalment of our four-part series on infidelity, relationship and sex expert Esther Perel takes on a thorny issue: Why people in happy relationships still sometimes wind up cheating.

Dear Lovehacker, What is the etiquette in disclosing casual relationships and polyamory to a prospective partner? My friends tell me to be upfront from the very start, but discussing it on a first date is so awkward! Is there a 'right' time to broach the subject?