He says he needs space but texts other girls?

So my boyfriend of 18 months just told me he’s been feeling suffocated & needs space. Okay fine I get it people need room to breathe. But then I accidentally saw his phone when he left it on the couch and he’s texting like three different girls every single day. Not just hey how’s it going crap either—inside jokes, calling one babe, sending memes at midnight. We haven’t had sex in over a month and every time I try to get close he says he’s tired or stressed about work. Meanwhile he’s out there being all flirty and engaged with other people? I didn’t say anything because I didn’t want to seem paranoid but now I can’t stop thinking about it. He’s never lied to me before but this feels off. Like are we broken up? Are we on a break? What does needing space even mean if you’re filling it with other women He’s supposed to meet my parents next month and I have no idea how to act around him now. Part of me wants to confront him part of me is scared of what he’ll actually say how do I even handle this without losing my mind