Making a bad business decision and living a shitty life doesn't entitle you to sue people who make a similar app just because their app's name uses some of the same letters as your app's name. (Both companies picked crappy names that are poor brands and poor trademarks. It's like calling your hamburger shop "Hamburger Shop" and then suing anyone who sells hamburgers for trademark infringement. It's not their fault you picked a generic name.)
Would you protect your company and its name?
With the facts I've heard today, absolutely not. Taking a competitor to court is an absolute last resort, done only in the most egregious of cases (serious fraud that people are associating with your business, etc.) While the case has legal merits, it has zero ethical merits. You picked a generic name. The other guy picked a similar generic name. He is not trying to compete and is not negatively affecting your business. You are being jackasses.
Making sacrifices to follow your dream does not give you the right to treat other people badly. You may be proud for the sacrifices you have made and the hard work you have put into your idea, but you deserve nothing for it. You're just another group of people equally good as every other group of people. Act like it.