is this cheating?

okay so my bf and i have always been very social and liked to go out on weekends with friends cause were still pretty young. so when i found out i was pregnant we knew that was all going to change. my bf then decided to go "seek advice" from his co-workers. that was fine cause i did it too but i went to his job once and had one of his co-workers constantly say "wow must be nice to be his gf". that was a little wierd to me so i looked through his phone and shortly after that, literally the next week, i see msgs in his phone from her and theyre going back & forth about being stressed out and how she wants to be there for him, how he needs all the support he can get...etc. seemed innocent but they kept adding hearts & 😘, 😏 after the sentences. she even invited him over to "netflix & chill" and everyone knows what that actually means. i caught it happening before it went that far but he keeps saying he didn't cheat because they didn't do anything physical... am i wrong for feeling cheated on? he says i need to get over it and understand that if he wanted to he could've cheated but i'm lucky he didn't. i really want to just dump his stupid ass but now we're having this baby together and i never wanted her in a split home. so confused 😣☹️😢