Guys only please......what is your opinion here !!?

Long story short, I went out with this guy for 3 months, not very long sure, but got into it quite deeply and fell in love with him......he went on a few dates with someone else a couple of months into it, and when I was upset, broke up....over text! It sounds bad, but I was really into him!!

A few months later we communicate again, I initiated it, and I was away so it was long distance, and he told me how much he still loves me, and flirting with me all the time, and sending me e-mails and calling me and saying he misses me.....but he’s also seeing that other girl now....and with me so far away he cannot think straight...

Now just yesterday I saw on a common’s friend’s status that they are having a bachelor party for him!! He hasn’t been answering my e-mails for the past week, and hasn’t mentioned anything like this at all!! Now he’s getting married suddenly?? He told me 2 weeks ago he still loves me!! I mean, wtf!!

I messaged him just casually and he said he was out traveling, as he and the other girl are making it official soon so it was a bachelor party for him!! I wrote to him saying that he's quite a piece of work, and that I hope he can be faithful to her in the future.....and he goes,

"there's no reason why I shouldn't express what I feel for someone. As far as the engagement is concerned, we decided in the past few days, so there’s nothing wrong there!

All I can say is, my intentions were clear & in the open and were never meant to hurt you..if u really feel I deserve this kinda reaction, then I guess I should just apologize (like I did the last time around!), and hope for u to see things rationally some day"

Am I just over reacting or is this really wrong? Like how can he express feelings for love for someone and decide to get engaged to someone else a few weeks later and think its all fine? Does that make sense? What about how he's making me feel by saying all this and then backing off?

I just want to know if I'm wrong for thinking this and is he right?