S.....you are going through one of the most common transitions now-a-days. I am so sorry that you have to watch your son go through this terrible time. Gosh, kids simply LOVE their daddy, don't they :o) It sounds like a stuffed animal would be a great idea! How about pictures of his daddy all over his room?
If I were in your situation, I would "protect my son". I would probably start "planting seeds" about how busy Daddy always is. That might be a phrase he could understand at 2. You dont want to "poison" your son against his daddy. The truth is, when your son is old enough to understand the situation, he will come to form his own opinion about his daddy. You don't want to influence that opinion, because he may resent you for it later.
Have you ever seen that movie "Liar, Liar" with Jim Carey? Well, it would be a good one to give to your ex-husband to remind him of how forgiving children can be....to a certain point. It's a very funny movie (obviously with Jim Carey), with a terrific point about divorced dads not spending enough time with their children. The "mother" in the movie, is a GREAT example of how mother's should be in these situations, in my opinion.
The good thing is, 2 times a week is ALOT of time. Your son will adjust to a new "regular" schedule. Thank goodness, his daddy makes the effort to see him like that. I DO agree that times shouldn't be promised. Men, in general, have "good intentions", but have broken their kids hearts time after time. I know my husband USED to do this :o)
Good Luck, S.. Things will start to work out. It sounds like a "fresh" situation. Given some time, your son will adjust :o)
Oh Yeah, just for the record, I disagree with EVER telling your son that his daddy "doesn't have time" or "is a flake", or whatever. That is how WE GROWN UPS feel, but a child will NEVER understand that until they are an adult. You should never lie to him, but always spare his daddy's reputation, and never "bash" his daddy. I've seen this backfire on the mother bigtime.
You are entering into a whole new level of "motherhood" as a single parent. With Grace, Patience and Trust in yourself, you will figure this all out :o)