Search Results: deciding between two guys

So my bf hangs out too much with his x-gf.
I dont know if i am exaggeting since some people tell me I am but here goes the story.
Four years ago this girl (for privacy pourposes im calling her Marie) and my ctual boyfriend ( lets call him Ben) had an online relationship since she lived in another state they would talk daily and be romantic with e/other. But when she came on the summer for some reason she freaked out and stopped talking to him altogheter. Then Ben trynig to find a reason contacted her sister (lets call her Ann) and he liked her and kept talking to her, thrn she told him that for loyalty to her sister they shouldn't talk. That is how i enter in the story, I was bff with Ann and thus he started talking to me we became pretty good friends and he admitted to still being mad with Marie, but then two years passed and we didn't hear from her, then a friend of her Ashley contacted Ben and told him that things with Marie ended too badly and if he wouldn't mind going out with her and Marie. He was curious about her (since she never explained herself) and from what he told me everything went well and they decided to be friends again, so they start talking nline again, since she has to go back home. And then Ben and I became a couple last spring, everything was going well but the mMarie came on summer and she wanted to hang out with him (just friends) so he, Marie and Ashley went out. Then, she moved premanently to the city and enrolled on Ben's school ( i go to another one). I didn't noticed anything going between them, but they had to participate on a play and ened up being the main cuple and had to be all touchy-feely with each other. Thus Ben claims that it was for the sake of the play. I confronted her and se told me that they were just friends. But thing is I know for a fact (i have friend on that school) that they always together, and when there are projects they always pair up, and he always waits after school until she is picked up. Also...

Should I take my ex back after he left me in the first place for his ex? Or should I just leave it alone and stay single?
Well... My ex left me for his ex girlfriend and now he wants me back. Let me start by saying that I'm only 22 years old but I'm very mature and I am looking for very serious relationships, not casual dating. We dated for about 6 months but we've lnown one another for about four years (we were on the same college track team). The last month of us things got a little rough between us and but we decided wed work things out. Two days later he text me saying that he just wanted to be friends. Me being me I simply said okay but I feel like you're leavinf me for another girl. Come to find out he left me for his ex girlfriend. And the entire time we were dating he constantly claimed that he had unfinished business with her (whatever that means). I saw that it was over between us, and when I see that in a relationship just cut the guy of iut my life and move one. Well he came back two months later wanting to apologize and get back together. I forgave him but didn't want to be friends. But we kept talking after that and now we may be trying to work it out. I have a lot of self respect for myself so that's not an issue. But I have zero trust in him now and I want stability in my life. I also don't want to worry if he will leave me again.

I met this guy on an online art website in February. We talked almost everyday until about a month or two ago and he became insanely distant on me. He met a girl a bit after me and for some reason I knew something was gonna happen between them two. It makes me mad that he has just decided to drop me from his life all together since they're now together. I shouldn't think about it but it just irritates me. I've messaged him maybe two or theee times and they're pretty far apart (like i didn't message him 2-3 times in a day) Should I message him a if yeah what should I say then?
Or should I just never talk to him if he messages me after just dropping me?