Why didnt he tell me he had a girlfriend?

I’ve known this guy for awhile now, and ibumped into him in a job orientation 2 months ago and ill admit I’ve always been attracted to him.. And I had a boyfriend and he&my ex boyfriend know each other but are enemies..

And I decided one day to call him from his friends phone [because he was fired] and ask him to hang out and if I could have his number.. And I called and he said it was fine and gave me his number.. When I told him if he wanted to hang out his tone of voice was different and asked me if we could hang out later..

I really was interested in him so I texted him two days later and was talking to him and he would ask me what I was doing and where do I live and stuff like that.. And I thought he was trying to get to know me..

One night he also texted me out of nowhere saying my name for example: “andrea…” and it was like at 3a.m and when I asked him the next day what it was he said nevermind forget it..and I really want to know what it was!

And then one day I was by the job place I ran into him at and he happens to live a few blocks away so I told him to come meet me..

He came unannounced and I was talking to him for awhile and he was smiling and we were talking and then he asked me “weren’t you with your boyfriend the other day because that’s what my friend told me” and I didn’t understand why he brought that up but anyway.. The next day I was asking him things and at first he was flirting like saying “hahaha” and stuff and being flirtacious and out of nowhere he texted me saying “dont take this the wrong way but I have a girlfriend and I don’t wanna give you the wrong idea but we can still be friends” and I told him that I didn’t like him I was just trying to meet new people and stuff.. I thought maybe his girlfriend caught him talking to me and he was forced to say that since the way he said it was not meant for me to stop talking to him

And I just stopped talking to him period.. And then I couldn’t get him off my mind I don’t know why I just couldn’t stop thinking of him.. But this whole time I was rocky with my boyfriend we were on and off.. And he doesn’t have the same number so icant contact him

So my job moved to a new location and I keep seeing him.. I always bump into him out of nowhere.. And he seemed quite nervous when I saw him. He was with a girl so I figured it was his girlfriend so I didn’t say anything to him..but I really wanted too, and it looked like they were arguing.. I’m not sure

Then two days later I called someone his name and they were like wtf? And I don’t know why…but I can’t get him off of my mind and I wonder if he liked me too..I really haven’t ever felt this way before and I don’t know what to do :[ I broke up with my boyfriend now and I really want to know why I’m feeling this way if maybe he liked me too! I wonder if he liked me too, please..give me your honest opinions

He also does graffiti and posts stickers up saying his name and hers possibly trying to make me jealous?