One of the most heartbreaking incidents in Judges is Samson's disastrous marriage. In a misunderstanding of classical proportions, his wife is given to another man before Samson consummates the marriage, and in a fit of jealous rage he avenges his abandonment on the entire Philistine nation, setting off a feud that consumes his whole life. An overreaction? Maybe, but Samson's flaming fox freak-out is symbolic in many ways of the jealousy and fear of abandonment in God's relationship with Israel.
More than perhaps any other book in the Bible, Judges drives home the idea (repeated throughout the Bible) that "I the Lord God am a jealous God" (KJV Ex. 20:5). In fact, jealous is one of his names (see Ex. 34:14), and he lives up to it during the lovers quarrel that is Judges.
God and Israel have a super unhealthy relationship. The very first of the Ten Commandments forbids worshipping other gods, and Israel's inability to do just that is a huge red flag that this probably isn't going to go well. Another issue is God's out-of-control jealousy toward other gods. This isn't just pout-at-home-and-eat-ice-cream jealousy; it's more like the slash-the-tires-of-every-guy-your-ex-looks-at kind. Like, seriously psycho. And although they are clearly guilty of infidelity, Israel gets upset when it seems like God's never there. If these two were our friends, we'd be giving them serious it's-time-to-break-up pep talks.