Is this right?

So I broke up with my boyfriend in August. It's been very hard to get over him since we work together and he was first real relationship that was very carefree (non-traditional). Anyways, during the past three months, I met another man and we have been talking but nothing serious. I still have very strong feelings for my ex so I didn't want to move too fast with this new man. Yesterday I met up with my ex to talk bout making it work again. He immediately asked to look through my phone because he had a doubt I was talking to someone else. I told him it's nothing serious and that he should just trust me. I ended up showing him my phone. (I had deleted the messages from the guy). Now who is to blame? Me or him? I mean we are both single so I can talk to whoever I want. Besides, I have a hunch that he's sleeping with other women because his massages don't pop up on his phone and we had shaved down in his private area and his armpits were also shaved which he's never done from the time I was with him. So should I feel bad? He never supported me, I paid for his bills, he never once took me out on a date, I've never even had an orgasm!! He is broke and depressed as hell and I worked my ass off for a year and a half to make him happy.